US20020124851A1 - Hearing protective device and method of making same - Google Patents

Hearing protective device and method of making same Download PDF

Info

Publication number
US20020124851A1
US20020124851A1 US09/990,654 US99065401A US2002124851A1 US 20020124851 A1 US20020124851 A1 US 20020124851A1 US 99065401 A US99065401 A US 99065401A US 2002124851 A1 US2002124851 A1 US 2002124851A1
Authority
US
United States
Prior art keywords
foam
component
earplug
mold
portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09/990,654
Inventor
Richard Knauer
Alan Seville
Robert Falco
James Hall
Lori Hall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cabot Safety Intermediate Corp
Original Assignee
Cabot Safety Intermediate Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US25343300P priority Critical
Priority to US09/990,654 priority patent/US20020124851A1/en
Application filed by Cabot Safety Intermediate Corp filed Critical Cabot Safety Intermediate Corp
Assigned to CABOT SAFETY INTERMEDIATE CORPORATION reassignment CABOT SAFETY INTERMEDIATE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HALL, JAMES SIGNED BY LORI S HALL LEGAL REPRESENTATIVE AND TRUSTEE, FALCO, ROBERT N., KNAUER, RICHARD, SEVILLE, ALAN R.
Publication of US20020124851A1 publication Critical patent/US20020124851A1/en
Assigned to DEUTSCHE BANK AG, NEW YORK BRANCH reassignment DEUTSCHE BANK AG, NEW YORK BRANCH SECURITY AGREEMENT Assignors: CABOT SAFETY INTERMEDIATE CORPORATION
Assigned to CABOT SAFETY INTERMEDIATE CORPORATION reassignment CABOT SAFETY INTERMEDIATE CORPORATION RELEASE OF SECURITY INTEREST Assignors: DEUTSCHE BANK AG, NEW YORK BRANCH
Assigned to BANK OF AMERICA, N.A., AS SECOND LIEN COLLATERAL AGENT reassignment BANK OF AMERICA, N.A., AS SECOND LIEN COLLATERAL AGENT SECURITY AGREEMENT Assignors: CABOT SAFETY INTERMEDIATE CORPORATION
Assigned to BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT reassignment BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT SECURITY AGREEMENT Assignors: CABOT SAFETY INTERMEDIATE CORPORATION
Assigned to CABOT SAFETY INTERMEDIATE CORPORATION reassignment CABOT SAFETY INTERMEDIATE CORPORATION RELEASE OF SECURITY INTEREST Assignors: DEUTSCHE BANK AG, NEW YORK BRANCH
Assigned to BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT reassignment BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT GRANT OF FIRST LIEN SECURITY INTEREST IN UNITED STATES PATENTS AND TRADEMARKS Assignors: CABOT SAFETY INTERMEDIATE CORPORATION
Assigned to CABOT SAFETY INTERMEDIATE CORPORATION reassignment CABOT SAFETY INTERMEDIATE CORPORATION RELEASE OF FIRST LIEN SECURITY INTEREST AT REEL/FRAME NO. 17435/0721 Assignors: BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT
Assigned to CABOT SAFETY INTERMEDIATE CORPORATION reassignment CABOT SAFETY INTERMEDIATE CORPORATION RELEASE OF SECOND LIEN SECURITY INTEREST AT REEL/FRAME NO. 17435/0764 Assignors: BANK OF AMERICA, N.A.
Assigned to CABOT SAFETY INTERMEDIATE CORPORATION reassignment CABOT SAFETY INTERMEDIATE CORPORATION RELEASE OF FIRST LIEN SECURITY INTEREST AT REEL/FRAME NO. 19520/0001 Assignors: BANK OF AMERICA, N.A.
Application status is Abandoned legal-status Critical

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00Methods or devices for treatment of the ears, e.g. surgical; Protective devices for the ears, carried on the body or in the hand; Non-electric hearing aids
    • A61F11/06Protective devices for the ears
    • A61F11/08Protective devices for the ears internal, e.g. earplugs
    • A61F11/12External mounting means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00Methods or devices for treatment of the ears, e.g. surgical; Protective devices for the ears, carried on the body or in the hand; Non-electric hearing aids
    • A61F11/06Protective devices for the ears
    • A61F11/08Protective devices for the ears internal, e.g. earplugs
    • A61F11/10Protective devices for the ears internal, e.g. earplugs inflatable or expandable
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/812Venting

Abstract

A hearing device including a foam, a foam insertable portion, a component, and a foam handle portion, and a method of forming the same. The component is nestable with and bondable with the foam such that the component is at least partially within the foam insertable portion and the foam handle portion. The hearing protective device includes earplugs attached to a flexible cord, under-the-chin element, or headband. A method of making a hearing protective device including disposing a component into a mold, introducing a foam or foamable mixture into the mold, causing the foam to rise such that the component is nested within and bonded with the foam.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This application claims the benefit of provisional application serial No. 60/253,433, filed on Nov. 28, 2000, which is herein incorporated by reference in its entirety.[0001]
  • BACKGROUND
  • The present invention relates generally to hearing protective devices, and more particularly to hearing protective devices including a semi-rigid component. [0002]
  • The use of hearing protective and noise attenuating devices are well known, and various types of devices are available for this purpose. Such devices include, but are not limited to, earplugs and semi-aural devices. Foam components are well known for use with these devices, providing both sound attenuation and enhanced comfort for the wearer. [0003]
  • Earplugs are generally preferred for continuous use over longer periods of time. Foam earplugs composed of resilient polymer foam materials such as foam rubber or polyurethane are well known in the art. Slow recovery foam earplugs, such as those disclosed in U.S. Reissue. No. 29,487 to Gardner, Jr., are not only comfortable, but have also been shown to deliver high in-field noise protection at all frequencies. U.S. Pat. No. 5,203,352 to Gardner, Jr. also discloses a hearing protective earplug comprising a polymeric foam. [0004]
  • A hearing protective device may further include a cord that is attached to a pair of earplugs and extends therebetween. Conventional cords are commonly designed so that the cord may be permanently attached to the earplugs and more specifically, each end of the cord may be permanently attached to stem portions of the respective earplugs. [0005]
  • A typical semi-aural hearing protector assembly generally includes a resilient U-shaped band with holders at opposite ends, and a pair of inwardly directed ear protectors (“pods”) that are detachably mounted to the holders. Semi-aural hearing protectors that enter the ear canal offer hearing protection but are somewhat less comfortable than those that simply cap the ear. U.S. Pat. No. 4,461,290 to Gardner, Jr. et al. discloses a semi-aural device incorporating a foam component. U.S. Pat. No. 4,671,265 to Anderson also discloses a semi-aural device. [0006]
  • With respect to these devices, the sound-attenuating (acoustical) component has been made both of flexible, rubber-like materials, and of foam. For earplugs and semi-aural devices, the rubber-like materials are advantageous because they allow the earplug or device to be directly inserted into the wearer's ear. However, such earplugs and devices typically become uncomfortable over long periods of use. Foam earplugs provide enhanced comfort, but may require rolling down before insertion. [0007]
  • A foam earplug with a stem can provide both the ease of insertion of rubber-like earplugs and the comfort of foam earplugs. A number of patents disclose earplugs having tips or flanges with a relatively stiff stem used to insert and remove the earplug. One earplug, shown in Prior Art FIG. 1, is described in U.S. Pat. No. 5,188,123 to Gardner, herein incorporated by reference. This earplug includes a circular or ovoid resilient polymeric foam body having a rounded nose end. An elongated stem is axially embedded in the foam body and extends rearward and axially therefrom. The earplug may be used in a push-in or roll-down insertion mode. [0008]
  • While suitable for certain purposes, this prior art earplug requires an additional manufacturing step over conventional plugs to secure the stem in the foam body. Also, the material of the foam body is prone to peel from the insert. In addition, inclusion of a hard stem in the earplug could be a hazard for the user, the general concern being that potential injury could result should the hearing protector become impacted. On the other hand, if the stem is too soft, it tends to buckle upon insertion, limiting the fit of the earplug and reducing the potential usefulness of the stem. [0009]
  • Another attempted solution to the above-discussed deficiencies in the art is the use of a porous component as a stem as disclosed in U.S. Pat. No. 5,799,658 to Falco. Therein, individual porous stems are mechanically bonded to the foam during manufacture by controlled penetration of the foam by the porous component stem. However, the individual porous stems are relatively expensive and somewhat difficult to manufacture. [0010]
  • Accordingly, there remains a need for a stemmed foam earplug that is effective in providing hearing protection, yet convenient and comfortable to use, and has a more efficient and lower cost method of manufacture. [0011]
  • SUMMARY
  • The above discussed and other problems and deficiencies of the prior art are overcome or alleviated by the hearing protective device and method of manufacture of the invention. [0012]
  • In a preferred embodiment, an earplug comprises a foam and at least one component that is nestable with and bondable with the foam. The component is disposed at least partially within a foam insertable portion and at least partially within a foam handle portion. [0013]
  • In the preferred method of the present invention, the component is initially disposed in a mold. A foam or foamable mixture is introduced into the mold causing the foam to rise and surround the component. The component is nestable with and bondable with the foam. Also the component is at least partially within a foam insertable portion and at least partially within a foam handle portion. [0014]
  • In another preferred embodiment, a venting portion is provided in the mold. In still another preferred embodiment, a venting portion is provided on the component. The venting portions allow gas to escape the mold during rising of the foam. Further, the venting portions retain the foam within the mold during rising, thus preventing spillage of the foam outside the mold. Also, an amount of the foam is permitted to cure in the venting portion to effectively seal off the mold thus maintaining a pressure within in the mold desirable for curing of the foam therein. [0015]
  • The above discussed and other features and advantages of the present invention will be appreciated and understood by those skilled in the art from the following detailed description and drawings. [0016]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • Referring now to the drawings wherein like elements are numbered alike in the several FIGS.: [0017]
  • FIG. 1 is a conventional earplug; [0018]
  • FIG. 2 is an elevational view of an earplug, according to one embodiment of the invention; [0019]
  • FIG. 3 is a cross-sectional view of the earplug of FIG. 2; [0020]
  • FIG. 4 is an end view of the earplug of FIG. 2; [0021]
  • FIG. 5 is a cross-sectional view of the earplug of FIG. 2 in another embodiment; [0022]
  • FIG. 6 is a cross-sectional view of the earplug of FIG. 2 in another embodiment; [0023]
  • FIG. 7 is a cross-sectional view of the earplug of FIG. 2 in another embodiment; [0024]
  • FIG. 8 is a cross-sectional view of the earplug of FIG. 2 in another embodiment; [0025]
  • FIG. 9 is a perspective view of a set of corded earplugs; [0026]
  • FIG. 10 is a perspective view of foam components and a semi-rigid headband for a semi-aural device; [0027]
  • FIG. 11 is a cross-sectional view of one embodiment of a mold for forming the earplug of FIG. 2; [0028]
  • FIG. 12 is a top view of the mold of FIG. 11; [0029]
  • FIG. 13A is an elevational view of one embodiment of a component stem of the earplug of FIG. 2; [0030]
  • FIG. 13B is an elevational view of another embodiment of the component stem of FIG. 13A; [0031]
  • FIG. 13C is an elevational view of another embodiment of the component stem of FIG. 13A; [0032]
  • FIGS. [0033] 14A-14B are various views of another embodiment of a mold upper portion of FIG. 11;
  • FIGS. [0034] 15A-15B are various views of another embodiment of the mold upper portion of FIG. 11;
  • FIGS. [0035] 16A-16B are various views of another embodiment of the mold upper portion of FIG. 11; and
  • FIGS. [0036] 17A-17H show one embodiment of a method for manufacturing the earplug of FIG. 2.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT
  • The device and method of manufacture of the invention comprises a foam and at least one component nestable with and bondable with the foam and a method of forming the same. [0037]
  • Referring now to FIGS. 2 and 3, in a preferred embodiment, a uniform foam earplug [0038] 10 comprises a foam insertable portion 12 and a foam handle portion 16. The foam substantially surrounds, encapsulates, or is nestable with and bondable with a component 14 having an embedded portion 18 with a tip 20. The embedded portion refers herein to that part of the component that is at least partially located within, and is bonded to, the foam insertable portion 12 and the foam handle portion 16. The foam handle portion 16 has a smaller diameter than the foam insertable portion 12. A depression 22, illustrated in FIG. 2 as a longitudinal groove, may extend within the foam handle portion 16 at least partially along the component 14. As is preferred, the earplug has a flange configuration 13. Alternate depressions (or a lack of depressions) and alternative earplug configurations are of course contemplated by the invention.
  • Referring now to FIG. 4, an end view of the exemplary earplug [0039] 10 is illustrated. The component 14 is disposed within the foam handle portion 16. As is illustrated by this embodiment, depressions 22 (four longitudinal grooves are shown) extend at least partially through the foam handle portion 16 and at least partially along a portion of the component 14.
  • Referring now to FIGS. [0040] 5-8, the preferred embodiments of the present invention are shown. Each figure illustrates a foam insertable portion 12, a flange 13, a component 14, a foam handle portion 16, an embedded portion 18, and a tip 20. FIG. 5 illustrates a bullet-shaped earplug. FIG. 6 illustrates a bell-shaped earplug. FIG. 7 illustrates a cone-shaped earplug. FIG. 8 illustrates a mushroom-shaped earplug.
  • The foam handle portions of two earplugs may be each attached to the end of a cord, an under-the-chin device, or a headband by bonding methods known in the art. Turning now to FIG. 9, a preferred embodiment includes respective earplugs [0041] 32, 34 that are each attached to respective ends 36, 38 of a cord of a device, shown generally at 30. FIG. 9 illustrates the foam insertable portion 12, the flange 13, the foam handle portion 16, and the longitudinal groove 22. The figure also illustrates the attachment of the cord ends 36, 38 to a passageway within the component 14 (e.g. a hollow component) of the earplugs.
  • Other means of cord attachment are contemplated, including attachment to at least one depression [0042] 22, to an exterior of the foam handle portion 16, and to an end of the component 14 (e.g., a solid component), among others.
  • The attachment of the earplugs [0043] 32, 34 to cord ends 36, 38 may occur by any known method in the art, but is preferably performed thermally, ultrasonically, or by crimping. Where the earplug and the cord materials are dissimilar, or where such materials do not form a strong bond under thermal or ultrasonic conditions, adhesives may additionally or alternatively be used.
  • Referring now to FIG. 10, a semi-aural device [0044] 40 is shown including earplugs 42, 44 attached to an under the chin device or headband component 45. The earplugs 42, 44 are each at least partially attached to respective ends 46, 48 of the headband 45. FIG. 10 illustrates the attachment of the earplugs 42, 44 to the headband ends 46, 48. The figure also illustrates the foam insertable portion 12, the flange 13, the component 14, the foam handle portion 16, and a longitudinal groove 22. The earplugs may attach to the headband by any method known in the art. The attachment method provides for the ability to remove the earplugs for replacement or cleaning.
  • Referring again to FIGS. [0045] 2-4, preferably, the component 14 is used as a stem of the earplug 10. As such, the component 14 should be rigid enough to aid insertion into the wearer's ear, yet soft and pliable enough to be comfortable and safe for the wearer. The semi-rigid component 14 should be selected of a material that is compatible with the foam of the insertable portion 12 and creates a bond between the component and the foam. Thus, the material is preferably a plastic material, but other embodiments may include paper, dense paper, rubber, foam, stiff foam, porous foam, relatively or semi-stiff foam, cardboard, or combinations thereof. The preferred component 14 can have disposed within at least one passage, such that the component 14 is hollow. Other passages (i.e. voids or relief cuts) are also contemplated for the component. The component 14 may also be of a solid or dense construction, and may include at least one passage. The component may also have disposed therein at least one indentation, dip or dimple.
  • Additionally, the component [0046] 14 may be of a different color than the foam of the earplug 10, such that the color of the component 14 is visible through the one or more depressions 22 that may be formed in the handle portion 16, thus clearly distinguishing the handle portion 16 of the earplug 10 for ease in inserting, removing, and otherwise identifying the earplug 10. The depression 22 may be in the form of longitudinal grooves, relief cuts, letters or designs, or the like. An earplug 10 with a hollow component 14 may be manufactured such that components of a receiver, or other communication devices, may be attached to the earplug for communication purposes.
  • Suitable foams for use with the earplug [0047] 10 include those foams known in the art to be appropriate for use with foam earplugs or other foam components for hearing protective devices. For example, such foams may include soft, pliable self-rising foams with instant recovery. Suitable foams may also include polyurethane or acrylic blend foams with slow recovery. Other foams include PVC, silicone, and nitrile, among others. A suitable foam is described in U.S. Pat. No. 5,792,998 to Gardner, Jr. et al., herein incorporated by reference. The earplug described therein is comprised of a dynamically stiff foam material having a low static stiffness, and a high dynamic stiffness. Another suitable foam is described in U.S. Pat. No. 4,158,087 to Wood, herein incorporated by reference.
  • In a method of manufacturing the earplug [0048] 10 of FIGS. 1-8, the component 14 is disposed, suspended, or placed into a cavity of an earplug mold. A foam or a foamable mixture is introduced into the mold, and caused to rise. Rising may be accomplished by any suitable means, for example by using a self-rising foam. As the foam rises, it at least partially surrounds, encapsulates, or is nestable with and bondable with, or bonds to, the component. Molding may be performed with any suitable molding process and device such as is known in the art.
  • An earplug mold [0049] 50, as shown in FIG. 11, includes a mold lower portion 52 and a mold upper portion 54.
  • The mold lower portion [0050] 52 is made of a rigid, non-porous material, for example, a polymeric material such as polypropylene or high-density polyethylene. Also, the mold lower portion 52 may be made of a metal such as aluminum. The mold lower portion 52 includes a lower cavity 56 for receiving and shaping a foam or foamable mixture 53 to form the foam insertable portion 12 of the earplug 10.
  • The mold upper portion [0051] 54 of the earplug mold 50 is made of a flexible material, for example, thermoplastic rubber, thermoset rubber, etc., and includes an upper cavity 58 for receiving and retaining the component 14 during manufacture of the earplug 10 and for receiving and shaping the rising foam 53, as discussed herein. In one embodiment, the component 14 is retained in the mold upper portion 54 by ribs 60 disposed in the cavity 58. In one embodiment, the ribs 60 include four flanges which project inwardly into the cavity 58 and traverse the cavity 58 in a longitudinal direction thereof.
  • To manufacture the earplug [0052] 10, the foam 53 is disposed in the mold lower cavity 56. The component 14, particularly shown in FIG. 13A, is inserted in the upper portion 54 such that the component 14 contacts the ribs 60 and is thus retained within the cavity 58. The mold upper portion 54 is positioned proximate the mold lower portion. The cavity 56 communicably engages the cavity 58. The foam 53 is allowed to rise from the cavity 56 into the cavity 58 and to encapsulate the component A bond is formed between the foam 53 and the encapsulated component 14. The foam is shaped by the lower and upper mold portions 52, 54, the foam 53 is allowed to cure, and then the foam 53 and component 14 are ejected from the mold 50 as the earplug 10.
  • In another embodiment, the component [0053] 14 includes component venting means 62, as shown in FIGS. 13B and 13C, to allow for a gas to escape from the mold cavities 56, 58 during manufacture of the earplug 10. Specifically, the component venting means 62 allows for gas to escape the cavities during the foaming process, that is, during rising and rising of the foam within the mold 50. The vented gas includes air originally present within the mold prior to the foaming process and any gas that may be evolved during the process.
  • The component venting means [0054] 62, in one embodiment, includes screw threads 64 disposed helically about the component 14. The screw threads 64 contact the mold upper portion 54 in the upper cavity 58 at least at a top end 66 of the mold upper portion 54. The contact of the screw threads 64 with the mold upper portion 54 forms vent passages there between which allow passage of gas during the foaming process. That is, vent passages are delimited by the screw threads 64 and a surface of the top end 66 of the upper mold portion 54 forming the upper mold cavity 58. The component 14 having screw threads 64 extends from the upper cavity 58 such that the vent passages traverse from the upper cavity 58 to an exterior of the of the mold upper portion 54. Thus, the vent passages allow gas to travel from the cavities 56, 58 to the exterior of the mold 50 during the foaming process. More specifically, as the foaming process commences, the foam begins to rise and occupy an increased volume of the mold cavities 56, 58, thus increasing the pressure within the cavities 56, 58. Due to this increased pressure, air residing within the mold cavities 56, 58 prior to commencement of the foaming process is forced out of the mold cavities 56, 58 through the vent passageways to an exterior of the mold 50.
  • The component venting means [0055] 62, in another embodiment, includes knurls 68, as shown in FIG. 13C. The knurls 68 are protrusions formed along the length of the component 14 which extend radially therefrom. When the component 14 having knurls 68 is inserted in the mold upper portion 54, the knurls 68 contact the mold upper portion 54 to form vent passageways therebetween. That is, the vent passageways are delimited by the knurls 68 and the surface of the top end 66 of the upper mold portion 54 forming the upper mold cavity 58. The vent passageways permit gas to travel from the cavities 56, 68 to the exterior of the mold 50 during the foaming process similarly as discussed above with reference to the screw threads 64.
  • The screw threads [0056] 64 and the knurls 68, in one embodiment, are formed along the length of the component 14. In another embodiment, the screw threads 64 and the knurls 68 are formed only at a top end 70 of the component 14. In still another embodiment, the screw threads 64 and knurls 68 are formed only at a confined portion located somewhere between respective ends of the component 14, for example, at a midpoint between the respective ends. The top end 70 of the component 14 contacts the top end 66 of the mold upper portion 54 when the component 14 is inserted in the mold upper portion 54 during the manufacture of the earplug 10.
  • Size and spacing of the screw threads [0057] 64 and the knurls 68 are predetermined to allow a certain volume of gas to pass through the vent passageways when a certain pressure accumulates in the cavities 56, 58 during the foaming process. Further, the screw threads 64 and the knurls 68 are designed to prevent passage of the rising foam 53 from the cavities 56, 58 to the exterior of the mold thus preserving the integrity of the mold 50 and reducing waste during the molding process.
  • Additionally, the screw threads [0058] 64 and the knurls 68 allow a certain volume of the rising foam 53 to enter the vent passageways and cure therein effectively sealing off the mold cavities 56, 58 from the exterior of the mold 50. That is, after the excess air within the mold cavities 56, 58 is vented, the rising foam 53 is permitted to fill the vent passageways and to cure therein. More specifically, the rising foam is directed through the vent passageways which act in this instance essentially as a tortuous path to shear a portion of the foam causing the foam to collapse and/or densify and cure therein to seal off the vent passageways. This sealing effect serves to maintain a pressure within the mold cavities 56, 58 optimal for curing of the foam and, hence, for formation of the earplug 10.
  • As a result of the densification of the foam at the vent passageways, the resulting earplug [0059] 10, as shown in FIGS. 2-4, includes foam formed at the screw threads 62 or the knurls 64. That is, foam which cures in the vent passageways to form the effective seal of the mold 50 is removed from the mold 50 as a portion of the earplug 10. The foam at the screw threads 62 or knurls 64 has a greater hardness and a higher density than foam formed at the insertable and handle portions 12 and 16, respectively.
  • In another embodiment, shown in FIGS. 14A and 14B, the mold upper portion [0060] 54 includes a screw vent portion 72 formed at the top end 66. The screw vent portion 72 includes screw threads 73 formed helically on the mold upper portion 54 along a longitudinal axis of the upper cavity 58.
  • During manufacture of the earplug [0061] 10, the component 14 of FIG. 13A is inserted in the upper mold portion 54 of FIG. 14B and retained therein by the ribs 60. The component 14 contacts the screw threads 73 of the screw vent portion 72 to form helical vent passages extending from the upper cavity 58 to the exterior of the mold upper portion 54. During the foaming process, gas, particularly air originally disposed within the cavities, travels from the upper cavity 58 through the vent passages to the exterior of the mold upper portion 54, similar to that described above with reference to the screw threads 64 formed on the component 14 shown in FIG. 13B.
  • In another embodiment, shown in FIGS. 15A and 15B, the mold upper portion [0062] 54 includes a knurled vent portion 74 formed at the top end 66. The knurled vent portion 74 includes knurls 75 protruding into the mold upper cavity 58. During manufacture of the earplug 10 using this embodiment of the mold upper portion 54, the component 14 of FIG. 13A is inserted in the cavity 58 and retained therein by the ribs 60 such the component 14 contacts the knurls thus forming vent passageways therebetween. During the foaming process, gas, particularly air originally disposed within the cavities, travels from the upper cavity 58 through the vent passages to the exterior of the mold upper portion, similar to that described above with reference to the knurls 68 formed on the component 14 shown in FIG. 13C.
  • In another embodiment, shown in FIGS. 16A and 16B, the mold upper portion [0063] 54 includes a flange vent portion 76 formed at the top end 66. The flange vent portion 76 includes annular flanges 77 formed on the mold upper portion 54 about a longitudinal axis thereof and projecting into the upper cavity 58. The flanges 77 include at least one space formed respectively therein. More preferably, the flanges include a plurality of spaces formed periodically across the annular distance of the flanges.
  • During manufacture of the earplug [0064] 10 using the mold upper portion 54 having the flange vent portion 76, the component 14 of FIG. 13A is inserted in the cavity 58 and retained therein by the ribs 60 such the component 14 contacts the flanges. Vent passageways are formed between the component 14 and the mold upper portion 54 by communication of the spaces in the flanges 77. Accordingly, during the foaming process, gas, particularly air originally disposed within the cavities, is permitted to travel from the upper cavity 58 through the vent passages formed by the communication of the annular tabs 77 and the upper mold portion 54 to the exterior of the mold upper portion, thus allowing optimal production of the earplug 10.
  • The upper mold portion [0065] 54 including at least one of the screw vent portion 72, knurl vent portion 74, and flange vent portion 76, as mentioned, allows gas to travel from the mold cavities 56, 58 to the exterior of the mold 50. Specifically, during the foaming process, the foam 53 rises within the cavities 56, 58 thus increasing the pressure therein. This increased pressure forces air originally present within the cavities 56, 58 to travel through the vent passages to the exterior of the mold 50. This venting allows proper rising and formation of the foam 53.
  • Additionally, the upper mold portion [0066] 54 including at least one of the screw vent portion 72, knurl vent portion 74, and flange vent portion 76, prevents overflow of the rising foam material 53 to the exterior of the mold 50 thus preserving the integrity of the mold 50 and reducing waste associated with the molding process.
  • Further, the upper mold portion [0067] 54 including at least one of the screw vent portion 72, knurl vent portion 74, and flange vent portion 76, allows a certain volume of the rising foam 53 to enter the vent passageways and cure therein effectively sealing off the mold cavities 56, 58 from the exterior of the mold 50. That is, after the excess air within the mold cavities 56, 58 is vented, the rising foam 53 is permitted to fill the vent passageways and to cure therein. This sealing effect serves to maintain a pressure within the mold cavities 56, 58 which is optimal for curing of the foam and, hence, for formation of the earplug 10.
  • FIGS. [0068] 17A-17H show a method of manufacturing the earplug 10 using the mold upper portion 54 including the screw vent portion 72.
  • In FIGS. 17A and 17B, the component [0069] 14 is inserted into the cavity 58 of the mold upper portion 54 and retained therein by ribs 60. The foam 53 is disposed in the cavity 56 of the mold lower portion 52, as shown in FIG. 17C. The mold upper portion 54 with the component 14 inserted and retained therein is brought in proximity of the mold lower portion 52, as shown in FIG. 17D.
  • In FIGS. 17E and 17F, the cavities [0070] 56 and 58 are brought into communication, the component extending from the cavity 58 into the cavity 56. The foam 53 is then allowed and/or caused to rise throughout the cavities 56 and 58. In this way, a portion of the component 14 exposed to the cavities 56 and 58 is completely encapsulated by the foam 53. The foam 53 is then cured into a shape determined by the shape of the cavities 56, 58. During this process, the foam 53 forms a strong bond directly with the component 14.
  • During the foam rising process, gas within the mold cavities [0071] 56, 58 is permitted to pass through the vent passageways formed between the screw vent portion 72 and the component 14 when the gas attains a certain pressure within the cavities 56, 58. This gas, as mentioned, is air originally disposed within the cavities 56, 58 and/or any gas that may be evolved or otherwise present during the foaming process.
  • The screw threads [0072] 73 of the screw vent portion 72 prohibit the rising foam material from spilling to the exterior of the mold 50. However, a certain amount of the rising foam material 53 is permitted to enter the vent passageways and to cure therein, sealing off the cavities 56, 58 from the exterior of the mold 50, and thus maintaining a desired pressure therein for curing of the foam and formation of the earplug 10.
  • Once the foam [0073] 53 has cured, the mold upper portion 54 is removed from engagement with the mold lower portion 52, as shown in FIG. 17G. The component 14 remains retained in the mold upper portion by the ribs 60. The foam 53, now bonded with the component 14, leaves the cavity 56 of the mold lower portion 52.
  • Then, as shown in FIG. 17H, a tool [0074] 78 is used to eject the component 14 with bonded foam 53 from the mold upper portion 54, thus completing the manufacturing of the earplug 10. Contact of the ribs 60 with the component 14 during manufacturing of the earplug 10 results in the formation of the depressions 22 which may be shaped as desired by shaping or contouring the ribs 60 accordingly.
  • The earplug [0075] 10 is also similarly manufactured utilizing the mold upper portion 54 having the knurled vent portion 74 and utilizing the mold upper portion 54 having the flange vent portion 76.
  • In another embodiment, continuous manufacture of a plurality of the earplugs [0076] 10 is provided by moving the mold lower portions 52 under a continuous pour machine which deposits a charge of the foam 53 in the cavities 53 and then engaging the mold upper portions with the mold lower portions to allow curing of the foam 53.
  • The invention, of which exemplary preferred embodiments are disclosed herein, provides a stemmed foam earplug that is effective in providing hearing protection, yet convenient and comfortable to use, and has a more efficient and lower cost method of manufacture. The earplug includes a foam insertion portion encapsulating and bonded directly to a component stem; the foam insertion portion providing a comfortable portion for an insertion into a wearer's ear; the component stem providing the necessary rigidity to facilitate proper insertion of the insertion portion into the ear and/or providing a means for connecting a cord, under the chin device, or headband component. [0077]
  • The method provided herein is particularly advantageous in that an effective earplug is produced easily, efficiently, at low cost, and without the necessity of an additional bonding step. Furthermore, the bond formed according to the present invention is strong and durable, resulting in a dependable earplug having a long use life. [0078]
  • The costs for manufacture of the invention are lower than for conventional earplugs because the disposing of the foam around the component eliminates the need for a separate bonding step, which was otherwise required to adhere the component to the foam and, further, because costly porous component stems are not required due to the disclosed venting means. [0079]
  • The venting means provided allows gas to escape from the cavities of the respective mold portions during the foaming process. The design of the venting means ensures that a desirable volume of gas escapes while preventing overflow of the foam from the cavities to the exterior of the mold. Further, the venting means allows a certain volume of the rising foam material to enter the vent passageways and to cure therein effectively sealing off the mold cavities from the exterior of the mold thus maintaining a desired pressure in the cavities optimal for curing the foam material and hence for forming the earplug. [0080]
  • The venting means allows utilization of simple, low cost component stems while ensuring consistent and optimal rising, curing, and bonding of the foam to form the earplug. [0081]
  • In these ways, the invention is effective for providing low cost, reliable hearing protection to a wearer which is convenient and comfortable to use. [0082]
  • While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation. [0083]

Claims (32)

1. An earplug comprising:
a foam; and
a component nestable with and bondable with said foam, wherein said component is disposed at least partially within a foam insertable portion and at least partially within a foam handle portion.
2. The earplug of claim 1, wherein said foam is selected from the group comprising polyurethane, acrylic, acrylic blends, and mixtures and combinations including at least one of the foregoing materials.
3. The earplug of claim 1, wherein said component is selected from the group comprising plastic, paper, dense paper, stiff foam, semi-stiff foam, foam, porous foam, cardboard, rubber, and combinations including at least one of the foregoing materials.
4. The earplug of claim 1, further comprising at least one depression formed in said foam at least partially along said component and at least partially along said foam handle portion.
5. The earplug of claim 1, wherein said at least one component has at least one passage disposed therein.
6. The earplug of claim 1, wherein said component comprises a vent for venting a mold during a manufacturing of the earplug.
7. The earplug of claim 6, wherein said vent comprises a screw threaded portion.
8. The earplug of claim 6, wherein said vent comprises a knurled portion.
9. The earplug of claim 6, wherein said vent is disposed across the length of the component
10. The earplug of claim 6 wherein said vent is disposed at a top of said component.
11. A set of a first earplug and a second earplug comprising:
a foam of said first earplug;
a foam of said second earplug;
a first component nestable with and bondable with said foam of said first earplug, wherein said first component is disposed at least partially within a first foam insertable portion and at least partially within a first foam handle portion;
a second component nestable with and bondable with said foam of said second earplug, wherein said second component is disposed at least partially within a first foam insertable portion and at least partially within a first foam handle portion; and
a connection device having a first end and a second end, the first end being attached to said first foam handle portion, and the second end being attached to said second foam handle portion.
12. The set of two earplugs of claim 11, wherein said foam of said first earplug and said foam of said second earplug is selected from the group comprising polyurethane, acrylic, acrylic blends, and mixtures and combinations including at least one of the foregoing materials.
13. The set of two earplugs of claim 11, wherein said first component and said second component is selected from the group comprising plastic, paper, dense paper, foam, porous foam, stiff foam, semi-stiff foam, cardboard, rubber, and combinations including at least one of the foregoing materials.
14. The set of two earplugs of claim 11, further comprising a depression formed in said foam of said first earplug at least partially along said first component and at least partially along said foam handle portion of said first earplug and in said foam of said second earplug at least partially along said second component and at least partially along said foam handle portion of said second earplug.
15. The set of two earplugs of claim 11, wherein said first component is nonporous and said second component is nonporous.
16. The set of two earplugs of claim 11, wherein said connection device is a flexible cord.
17. The set of two earplugs of claim 11, wherein said connection device is an under the chin device or a headband.
18. A method of making an earplug comprising:
disposing a component within a mold;
introducing a foam or foamable mixture into said mold; and
causing said foam or said foamable mixture to rise about said component such that said component is nested within and bonded with said foam, such that said component is at least partially within a foam insertable portion and at least partially within a foam handle portion.
19. The method of claim 18, wherein said foam or said foamable mixture is self-rising.
20. The method of claim 18, wherein said foam is selected from the group comprising polyurethane, acrylic, acrylic blends, and mixtures and combinations including at least one of the foregoing materials, and wherein said component is selected from the group comprising plastic, paper, dense paper, foam, porous foam, stiff foam, semi-stiff foam, cardboard, rubber, and combinations including at least one of the foregoing materials.
21. The method of claim 18, further comprising forming a depression in said foam along said component.
22. The method of claim 18, further comprising forming a passage in said component.
23. The method of claim 18, further comprising venting the mold during said causing said foam or foamable mixture to rise to allow a gas to move from an interior of the mold to an exterior of the mold.
24. The method of claim 23 wherein said venting includes forming venting passageways between the component and the mold during said disposing of the component within the mold.
25. The method of claim 24, wherein said venting passageways extend from the interior to the exterior.
26. The method of claim 23, further comprising sealing said interior of said mold from said exterior after said venting.
27. The method of claim 26, wherein said sealing comprises allowing a volume of said rising foam or foamable mixture to enter a vent used in said venting and curing said volume therein.
28. A mold for forming a foam earplug comprising:
a lower mold portion including a lower cavity; and
an upper mold portion including an upper cavity and a means for venting a gas during a rising of the foam;
wherein the lower and upper mold portions are engageable so as to communicably engage the lower and upper cavities.
29. The mold of claim 28 wherein said means for venting comprises a screw thread helically disposed on the upper mold portion in the upper cavity.
30. The mold of claim 28 wherein said means for venting comprises a plurality of knurls disposed on the upper mold portion in the upper cavity.
31. The mold of claim 27 wherein said means for venting comprises at least one annular flange disposed on the upper mold portion in the upper cavity, the flange including at least one space formed therein to allow said venting of said gas.
32. The mold of claim 27 further comprising a plurality of ribs projecting from the upper mold portion radially into the upper cavity and traversing the upper cavity in a longitudinal direction.
US09/990,654 2000-11-28 2001-11-21 Hearing protective device and method of making same Abandoned US20020124851A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US25343300P true 2000-11-28 2000-11-28
US09/990,654 US20020124851A1 (en) 2000-11-28 2001-11-21 Hearing protective device and method of making same

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/990,654 US20020124851A1 (en) 2000-11-28 2001-11-21 Hearing protective device and method of making same
US11/357,768 US7731487B2 (en) 2000-11-28 2006-02-17 Mold for forming a hearing protective device
US11/357,792 US7727433B2 (en) 2000-11-28 2006-02-17 Hearing protective device and method of making the same

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US11/357,768 Division US7731487B2 (en) 2000-11-28 2006-02-17 Mold for forming a hearing protective device
US11/357,792 Division US7727433B2 (en) 2000-11-28 2006-02-17 Hearing protective device and method of making the same

Publications (1)

Publication Number Publication Date
US20020124851A1 true US20020124851A1 (en) 2002-09-12

Family

ID=22960235

Family Applications (3)

Application Number Title Priority Date Filing Date
US09/990,654 Abandoned US20020124851A1 (en) 2000-11-28 2001-11-21 Hearing protective device and method of making same
US11/357,768 Active US7731487B2 (en) 2000-11-28 2006-02-17 Mold for forming a hearing protective device
US11/357,792 Active 2023-02-27 US7727433B2 (en) 2000-11-28 2006-02-17 Hearing protective device and method of making the same

Family Applications After (2)

Application Number Title Priority Date Filing Date
US11/357,768 Active US7731487B2 (en) 2000-11-28 2006-02-17 Mold for forming a hearing protective device
US11/357,792 Active 2023-02-27 US7727433B2 (en) 2000-11-28 2006-02-17 Hearing protective device and method of making the same

Country Status (15)

Country Link
US (3) US20020124851A1 (en)
EP (1) EP1339364B1 (en)
JP (1) JP2004520874A (en)
AT (1) AT384509T (en)
AU (1) AU1787502A (en)
BR (1) BR0115887B1 (en)
CA (1) CA2430121A1 (en)
DE (1) DE60132617T2 (en)
DK (1) DK1339364T3 (en)
ES (1) ES2300387T3 (en)
MX (1) MXPA03004735A (en)
NO (1) NO20032397A (en)
PT (1) PT1339364E (en)
WO (1) WO2002043633A1 (en)
ZA (1) ZA200304088B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004021941A1 (en) * 2002-09-06 2004-03-18 Cabot Safety Intermediate Corporation Earplug and method manufacturing an earplug
US20040079579A1 (en) * 2002-10-28 2004-04-29 Barwacz Robert Franciszek Corded hearing protective device and method of manufacturing the same
US20050056289A1 (en) * 2003-09-12 2005-03-17 Jenkins John Allen Earplug with bendable stiffener
US20060118124A1 (en) * 2004-12-01 2006-06-08 Edwin Woo Dual density earplug
US20080314393A1 (en) * 2007-06-22 2008-12-25 Ricky Wayne Purcell Self-conforming sound attenuation earplug
US20100119076A1 (en) * 2008-11-12 2010-05-13 The Timao Group, Inc. Hearing Protection Device Ear Seal With Acoustic Barrier
US8113207B2 (en) 2008-08-22 2012-02-14 Kimberly-Clark Worldwide, Inc. Self-conforming sound attenuation earplug
US20140233753A1 (en) * 2013-02-11 2014-08-21 Matthew Waldman Headphones with cloud integration

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005009132U1 (en) 2005-06-10 2005-08-25 Uvex Arbeitsschutz Gmbh Ear plug for inserting into the ear passage comprises a foam material with a recess with a cross-like configuration
US8596279B2 (en) * 2005-11-09 2013-12-03 3M Innovative Properties Company Offset stem for earplug and earplug formed therewith
US7837005B2 (en) * 2006-03-21 2010-11-23 Etymotic Research, Inc. Mushroom-shaped push-in foam eartip for use with high-fidelity insert earphones
US8061472B2 (en) * 2009-06-03 2011-11-22 Sperian Hearing Protection, Llc Non-roll foam eartip
KR100974152B1 (en) * 2010-03-15 2010-08-04 구자헌 Non-adhensive anti-noise earplug and method for fabricating the same
US8870558B2 (en) * 2011-07-06 2014-10-28 Daniel R. Schumaier Earplug shaper having curved shaping surfaces
US8968613B2 (en) * 2012-07-12 2015-03-03 3M Innovative Properties Company Method of making an earplug
US8679607B2 (en) 2012-07-12 2014-03-25 3M Innovative Properties Company Foamable article
US9737439B2 (en) * 2012-07-12 2017-08-22 3M Innovative Properties Company Push-in earplug
RU2659253C1 (en) * 2013-06-28 2018-06-29 3М Инновейтив Пропертиз Компани Method of ear plug making
US9445177B2 (en) * 2013-11-18 2016-09-13 3M Innovative Properties Company Hearing device tether with acoustic decoupling section
USD831832S1 (en) 2016-02-26 2018-10-23 Benjamin S. Rappaport Ear plug
USD810272S1 (en) 2016-03-04 2018-02-13 Benjamin S. Rappaport Ear plug having piston-like exterior

Citations (91)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538339A (en) * 1949-09-15 1951-01-16 Mary J Thomas Earplug
US2804072A (en) * 1955-03-29 1957-08-27 Genzer Rose Ear plugs
US3800791A (en) * 1973-05-15 1974-04-02 Flents Prod Co Inc Adjustable ear plug
US3945052A (en) * 1972-05-01 1976-03-23 Meadox Medicals, Inc. Synthetic vascular graft and method for manufacturing the same
USRE29487E (en) * 1971-10-26 1977-12-06 Cabot Corporation Earplugs
US4130904A (en) * 1977-06-06 1978-12-26 Thermo Electron Corporation Prosthetic blood conduit
US4434794A (en) * 1981-06-15 1984-03-06 Leight Howard S Disposable ear plug
US4461290A (en) * 1980-09-08 1984-07-24 Cabot Corporation Hearing protectors
US4503569A (en) * 1983-03-03 1985-03-12 Dotter Charles T Transluminally placed expandable graft prosthesis
US4512338A (en) * 1983-01-25 1985-04-23 Balko Alexander B Process for restoring patency to body vessels
US4550447A (en) * 1983-08-03 1985-11-05 Shiley Incorporated Vascular graft prosthesis
US4647416A (en) * 1983-08-03 1987-03-03 Shiley Incorporated Method of preparing a vascular graft prosthesis
US4671265A (en) * 1984-11-29 1987-06-09 Bilsom Ab Earplug device
US4718907A (en) * 1985-06-20 1988-01-12 Atrium Medical Corporation Vascular prosthesis having fluorinated coating with varying F/C ratio
US4728328A (en) * 1984-10-19 1988-03-01 Research Corporation Cuffed tubular organic prostheses
US4774949A (en) * 1983-06-14 1988-10-04 Fogarty Thomas J Deflector guiding catheter
US4820298A (en) * 1987-11-20 1989-04-11 Leveen Eric G Internal vascular prosthesis
US4946363A (en) * 1988-07-20 1990-08-07 Union Carbide Chemicals And Plastics Company Inc. Mold and mold vent
US4957508A (en) * 1986-10-31 1990-09-18 Ube Industries, Ltd. Medical tubes
US5019090A (en) * 1988-09-01 1991-05-28 Corvita Corporation Radially expandable endoprosthesis and the like
US5035706A (en) * 1989-10-17 1991-07-30 Cook Incorporated Percutaneous stent and method for retrieval thereof
US5044463A (en) * 1989-11-30 1991-09-03 Cabot Corporation Molded foam earplug and method for making same
US5064435A (en) * 1990-06-28 1991-11-12 Schneider (Usa) Inc. Self-expanding prosthesis having stable axial length
US5071331A (en) * 1990-08-27 1991-12-10 Cabot Safety Corporation Mold for foam products
US5078726A (en) * 1989-02-01 1992-01-07 Kreamer Jeffry W Graft stent and method of repairing blood vessels
US5122154A (en) * 1990-08-15 1992-06-16 Rhodes Valentine J Endovascular bypass graft
US5123917A (en) * 1990-04-27 1992-06-23 Lee Peter Y Expandable intraluminal vascular graft
US5151105A (en) * 1991-10-07 1992-09-29 Kwan Gett Clifford Collapsible vessel sleeve implant
US5163958A (en) * 1989-02-02 1992-11-17 Cordis Corporation Carbon coated tubular endoprosthesis
US5188123A (en) * 1990-08-20 1993-02-23 Cabot Safety Corporation Hearing protective earplug having alternative modes of insertion
US5203352A (en) * 1990-10-16 1993-04-20 Cabot Safety Corporation Polymeric foam earplug
US5211658A (en) * 1991-11-05 1993-05-18 New England Deaconess Hospital Corporation Method and device for performing endovascular repair of aneurysms
US5219355A (en) * 1990-10-03 1993-06-15 Parodi Juan C Balloon device for implanting an aortic intraluminal prosthesis for repairing aneurysms
US5226913A (en) * 1988-09-01 1993-07-13 Corvita Corporation Method of making a radially expandable prosthesis
US5229045A (en) * 1991-09-18 1993-07-20 Kontron Instruments Inc. Process for making porous membranes
US5282823A (en) * 1992-03-19 1994-02-01 Medtronic, Inc. Intravascular radially expandable stent
US5282824A (en) * 1990-10-09 1994-02-01 Cook, Incorporated Percutaneous stent assembly
US5282847A (en) * 1991-02-28 1994-02-01 Medtronic, Inc. Prosthetic vascular grafts with a pleated structure
US5316023A (en) * 1992-01-08 1994-05-31 Expandable Grafts Partnership Method for bilateral intra-aortic bypass
US5330500A (en) * 1990-10-18 1994-07-19 Song Ho Y Self-expanding endovascular stent with silicone coating
US5344601A (en) * 1989-07-04 1994-09-06 John Newton Molding method using two different resins and a membrane
US5354308A (en) * 1992-05-01 1994-10-11 Beth Israel Hospital Association Metal wire stent
US5360443A (en) * 1990-06-11 1994-11-01 Barone Hector D Aortic graft for repairing an abdominal aortic aneurysm
US5366504A (en) * 1992-05-20 1994-11-22 Boston Scientific Corporation Tubular medical prosthesis
US5370683A (en) * 1992-03-25 1994-12-06 Cook Incorporated Vascular stent
US5383928A (en) * 1992-06-10 1995-01-24 Emory University Stent sheath for local drug delivery
US5397345A (en) * 1983-12-09 1995-03-14 Endovascular Technologies, Inc. Artificial graft and implantation method
US5405377A (en) * 1992-02-21 1995-04-11 Endotech Ltd. Intraluminal stent
US5425765A (en) * 1993-06-25 1995-06-20 Tiefenbrun; Jonathan Surgical bypass method
US5425767A (en) * 1992-11-02 1995-06-20 Sulzer Medizinaltechnik Ag Anchor for an artificial ligament
US5443499A (en) * 1993-01-14 1995-08-22 Meadox Medicals, Inc. Radially expandable tubular prosthesis
US5456713A (en) * 1991-10-25 1995-10-10 Cook Incorporated Expandable transluminal graft prosthesis for repairs of aneurysm and method for implanting
US5476506A (en) * 1994-02-08 1995-12-19 Ethicon, Inc. Bi-directional crimped graft
US5507767A (en) * 1992-01-15 1996-04-16 Cook Incorporated Spiral stent
US5507769A (en) * 1994-10-18 1996-04-16 Stentco, Inc. Method and apparatus for forming an endoluminal bifurcated graft
US5507771A (en) * 1992-06-15 1996-04-16 Cook Incorporated Stent assembly
US5514178A (en) * 1993-06-24 1996-05-07 Synthelabo Prosthesis for bodily canal
US5545220A (en) * 1993-11-04 1996-08-13 Lipomatrix Incorporated Implantable prosthesis with open cell textured surface and method for forming same
US5545210A (en) * 1994-09-22 1996-08-13 Advanced Coronary Technology, Inc. Method of implanting a permanent shape memory alloy stent
US5556426A (en) * 1994-08-02 1996-09-17 Meadox Medicals, Inc. PTFE implantable tubular prostheses with external coil support
US5562724A (en) * 1993-12-15 1996-10-08 William Cook Europe A/S Endovascular graft prosthesis and an implantation method for such a prosthesis
US5584885A (en) * 1994-04-28 1996-12-17 Seckel; Brooke R. Nerve regeneration chamber
US5591229A (en) * 1990-06-11 1997-01-07 Parodi; Juan C. Aortic graft for repairing an abdominal aortic aneurysm
US5609627A (en) * 1994-02-09 1997-03-11 Boston Scientific Technology, Inc. Method for delivering a bifurcated endoluminal prosthesis
US5617878A (en) * 1996-05-31 1997-04-08 Taheri; Syde A. Stent and method for treatment of aortic occlusive disease
US5618301A (en) * 1993-10-07 1997-04-08 Angiomed Ag Reducing stent, device with reducing stent and use of a reducing stent
US5628783A (en) * 1991-04-11 1997-05-13 Endovascular Technologies, Inc. Bifurcated multicapsule intraluminal grafting system and method
US5632772A (en) * 1993-10-21 1997-05-27 Corvita Corporation Expandable supportive branched endoluminal grafts
US5632763A (en) * 1995-01-19 1997-05-27 Cordis Corporation Bifurcated stent and method for implanting same
US5639278A (en) * 1993-10-21 1997-06-17 Corvita Corporation Expandable supportive bifurcated endoluminal grafts
US5653747A (en) * 1992-12-21 1997-08-05 Corvita Corporation Luminal graft endoprostheses and manufacture thereof
US5653743A (en) * 1994-09-09 1997-08-05 Martin; Eric C. Hypogastric artery bifurcation graft and method of implantation
US5662675A (en) * 1995-02-24 1997-09-02 Intervascular, Inc. Delivery catheter assembly
US5676697A (en) * 1996-07-29 1997-10-14 Cardiovascular Dynamics, Inc. Two-piece, bifurcated intraluminal graft for repair of aneurysm
US5693088A (en) * 1993-11-08 1997-12-02 Lazarus; Harrison M. Intraluminal vascular graft
US5716410A (en) * 1993-04-30 1998-02-10 Scimed Life Systems, Inc. Temporary stent and method of use
US5723004A (en) * 1993-10-21 1998-03-03 Corvita Corporation Expandable supportive endoluminal grafts
US5733325A (en) * 1993-11-04 1998-03-31 C. R. Bard, Inc. Non-migrating vascular prosthesis and minimally invasive placement system
US5735290A (en) * 1993-02-22 1998-04-07 Heartport, Inc. Methods and systems for performing thoracoscopic coronary bypass and other procedures
US5792998A (en) * 1993-04-19 1998-08-11 Cabot Safety Intermediate Corporation Acoustical hearing protective devices utilizing dynamically stiff foam and methods of producing same
US5799658A (en) * 1996-08-15 1998-09-01 Cabot Safety Intermediate Corporation Hearing protective device comprising a foam and a porous component and method of manufacture thereof
US5843166A (en) * 1997-01-17 1998-12-01 Meadox Medicals, Inc. Composite graft-stent having pockets for accomodating movement
US5851232A (en) * 1997-03-15 1998-12-22 Lois; William A. Venous stent
US6105715A (en) * 1999-11-05 2000-08-22 Aearo Company Multi-color variably attenuating earplug
US6168619B1 (en) * 1998-10-16 2001-01-02 Quanam Medical Corporation Intravascular stent having a coaxial polymer member and end sleeves
US6214040B1 (en) * 1997-10-20 2001-04-10 Iowa-India Investments Company Limited Sandwich stent with spiraling bands on an outer surface
US6364052B1 (en) * 2000-03-14 2002-04-02 Ivan Mclean, Inc. Earplugs with surface ornamentation
US6427800B1 (en) * 1999-11-03 2002-08-06 Dalloz Safety Ab Ear plug and method of manufacturing an ear plug
US20030029459A1 (en) * 2001-08-10 2003-02-13 Jim Tiemens Earplug with stiffener
US20030029460A1 (en) * 2001-08-10 2003-02-13 Jim Tiemens Extruded earplug
US20030029458A1 (en) * 2001-08-10 2003-02-13 Jim Tlemens Multiple earplug arrangement

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US29487A (en) 1860-08-07 Refrigerator
LU33181A1 (en) * 1954-03-02
US3148430A (en) * 1963-01-04 1964-09-15 Lester H Hanner Soap saver
DE1566341A1 (en) * 1967-08-25 1970-07-23 Richard Heinrich Geraeuschschutz for the auditory canal
DE2325823A1 (en) * 1973-05-22 1974-12-19 Envac Ets Ear protection
US4158087A (en) 1977-05-27 1979-06-12 W. R. Grace & Co. Urethane foams having low resiliency
US4412962A (en) * 1980-08-04 1983-11-01 Rogers Corporation Method of molding a mechanically frothed urethane resin foam and an open-top injection mold therefore
SE442946B (en) * 1980-10-22 1986-02-10 Gullfiber Ab Earplug and Method and device for the front tell up
US4666323A (en) * 1981-06-26 1987-05-19 Milton Kessler Cap and brush assembly and method of forming it
US4443173A (en) * 1983-03-21 1984-04-17 Amp Incorporated Molding apparatus including insert feeding means
US4867149A (en) * 1985-03-29 1989-09-19 Cabot Corporation Earplugs
US4795331A (en) * 1986-09-15 1989-01-03 The Goodyear Tire & Rubber Company Mold vent plug
US4784366A (en) * 1987-08-13 1988-11-15 Davidson Textron Inc. Pour hole lock system
US5087188A (en) 1987-11-18 1992-02-11 Staver Robert B Dies for forming soap with attached member
DE69132146T2 (en) * 1990-08-20 2001-03-01 Cabot Safety Intermediate Corp einsetzweisen hearing protective earplug with alternative
US5483027A (en) * 1994-08-24 1996-01-09 Krause; Ward B. Earplug with form-fitting fluid chambers
US5674196A (en) * 1996-01-05 1997-10-07 Donaldson; John Device for introducing medical fluid into the human ear
SE513688C2 (en) * 1996-12-12 2000-10-23 Dalloz Safety Ab Earplug, method of making an integrated earplug and the use of multimaterial-injection molding for producing such an earplug
US5997783A (en) * 1997-10-31 1999-12-07 Woodbridge Foam Corporation Method for producing a molded article using a vented mold
CA2332236A1 (en) * 1999-03-16 2000-09-21 Robert N. Falco Hearing protective device
US7294138B2 (en) * 2004-06-28 2007-11-13 Shippert Ronald D Nose pack method and apparatus

Patent Citations (95)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538339A (en) * 1949-09-15 1951-01-16 Mary J Thomas Earplug
US2804072A (en) * 1955-03-29 1957-08-27 Genzer Rose Ear plugs
USRE29487E (en) * 1971-10-26 1977-12-06 Cabot Corporation Earplugs
US3945052A (en) * 1972-05-01 1976-03-23 Meadox Medicals, Inc. Synthetic vascular graft and method for manufacturing the same
US3800791A (en) * 1973-05-15 1974-04-02 Flents Prod Co Inc Adjustable ear plug
US4130904A (en) * 1977-06-06 1978-12-26 Thermo Electron Corporation Prosthetic blood conduit
US4461290A (en) * 1980-09-08 1984-07-24 Cabot Corporation Hearing protectors
US4434794A (en) * 1981-06-15 1984-03-06 Leight Howard S Disposable ear plug
US4512338A (en) * 1983-01-25 1985-04-23 Balko Alexander B Process for restoring patency to body vessels
US4503569A (en) * 1983-03-03 1985-03-12 Dotter Charles T Transluminally placed expandable graft prosthesis
US4774949A (en) * 1983-06-14 1988-10-04 Fogarty Thomas J Deflector guiding catheter
US4550447A (en) * 1983-08-03 1985-11-05 Shiley Incorporated Vascular graft prosthesis
US4647416A (en) * 1983-08-03 1987-03-03 Shiley Incorporated Method of preparing a vascular graft prosthesis
US5397345A (en) * 1983-12-09 1995-03-14 Endovascular Technologies, Inc. Artificial graft and implantation method
US4728328A (en) * 1984-10-19 1988-03-01 Research Corporation Cuffed tubular organic prostheses
US4671265A (en) * 1984-11-29 1987-06-09 Bilsom Ab Earplug device
US4718907A (en) * 1985-06-20 1988-01-12 Atrium Medical Corporation Vascular prosthesis having fluorinated coating with varying F/C ratio
US4957508A (en) * 1986-10-31 1990-09-18 Ube Industries, Ltd. Medical tubes
US4820298A (en) * 1987-11-20 1989-04-11 Leveen Eric G Internal vascular prosthesis
US4946363A (en) * 1988-07-20 1990-08-07 Union Carbide Chemicals And Plastics Company Inc. Mold and mold vent
US5226913A (en) * 1988-09-01 1993-07-13 Corvita Corporation Method of making a radially expandable prosthesis
US5019090A (en) * 1988-09-01 1991-05-28 Corvita Corporation Radially expandable endoprosthesis and the like
US5078726A (en) * 1989-02-01 1992-01-07 Kreamer Jeffry W Graft stent and method of repairing blood vessels
US5163958A (en) * 1989-02-02 1992-11-17 Cordis Corporation Carbon coated tubular endoprosthesis
US5344601A (en) * 1989-07-04 1994-09-06 John Newton Molding method using two different resins and a membrane
US5035706A (en) * 1989-10-17 1991-07-30 Cook Incorporated Percutaneous stent and method for retrieval thereof
US5044463A (en) * 1989-11-30 1991-09-03 Cabot Corporation Molded foam earplug and method for making same
US5123917A (en) * 1990-04-27 1992-06-23 Lee Peter Y Expandable intraluminal vascular graft
US5591229A (en) * 1990-06-11 1997-01-07 Parodi; Juan C. Aortic graft for repairing an abdominal aortic aneurysm
US5360443A (en) * 1990-06-11 1994-11-01 Barone Hector D Aortic graft for repairing an abdominal aortic aneurysm
US5064435A (en) * 1990-06-28 1991-11-12 Schneider (Usa) Inc. Self-expanding prosthesis having stable axial length
US5122154A (en) * 1990-08-15 1992-06-16 Rhodes Valentine J Endovascular bypass graft
US5188123A (en) * 1990-08-20 1993-02-23 Cabot Safety Corporation Hearing protective earplug having alternative modes of insertion
US5071331A (en) * 1990-08-27 1991-12-10 Cabot Safety Corporation Mold for foam products
US5219355A (en) * 1990-10-03 1993-06-15 Parodi Juan C Balloon device for implanting an aortic intraluminal prosthesis for repairing aneurysms
US5282824A (en) * 1990-10-09 1994-02-01 Cook, Incorporated Percutaneous stent assembly
US5203352A (en) * 1990-10-16 1993-04-20 Cabot Safety Corporation Polymeric foam earplug
US5330500A (en) * 1990-10-18 1994-07-19 Song Ho Y Self-expanding endovascular stent with silicone coating
US5282847A (en) * 1991-02-28 1994-02-01 Medtronic, Inc. Prosthetic vascular grafts with a pleated structure
US5769885A (en) * 1991-04-11 1998-06-23 Endovascular Technologies, Inc. Bifurcated multicapsule intraluminal grafting system and method
US5628783A (en) * 1991-04-11 1997-05-13 Endovascular Technologies, Inc. Bifurcated multicapsule intraluminal grafting system and method
US5229045A (en) * 1991-09-18 1993-07-20 Kontron Instruments Inc. Process for making porous membranes
US5387621A (en) * 1991-09-18 1995-02-07 Kontron Instruments, Inc. Porous membranes based on unstable polymer solutions
US5151105A (en) * 1991-10-07 1992-09-29 Kwan Gett Clifford Collapsible vessel sleeve implant
US5456713A (en) * 1991-10-25 1995-10-10 Cook Incorporated Expandable transluminal graft prosthesis for repairs of aneurysm and method for implanting
US5211658A (en) * 1991-11-05 1993-05-18 New England Deaconess Hospital Corporation Method and device for performing endovascular repair of aneurysms
US5316023A (en) * 1992-01-08 1994-05-31 Expandable Grafts Partnership Method for bilateral intra-aortic bypass
US5507767A (en) * 1992-01-15 1996-04-16 Cook Incorporated Spiral stent
US5405377A (en) * 1992-02-21 1995-04-11 Endotech Ltd. Intraluminal stent
US5282823A (en) * 1992-03-19 1994-02-01 Medtronic, Inc. Intravascular radially expandable stent
US5443496A (en) * 1992-03-19 1995-08-22 Medtronic, Inc. Intravascular radially expandable stent
US5370683A (en) * 1992-03-25 1994-12-06 Cook Incorporated Vascular stent
US5354308A (en) * 1992-05-01 1994-10-11 Beth Israel Hospital Association Metal wire stent
US5366504A (en) * 1992-05-20 1994-11-22 Boston Scientific Corporation Tubular medical prosthesis
US5383928A (en) * 1992-06-10 1995-01-24 Emory University Stent sheath for local drug delivery
US5507771A (en) * 1992-06-15 1996-04-16 Cook Incorporated Stent assembly
US5425767A (en) * 1992-11-02 1995-06-20 Sulzer Medizinaltechnik Ag Anchor for an artificial ligament
US5653747A (en) * 1992-12-21 1997-08-05 Corvita Corporation Luminal graft endoprostheses and manufacture thereof
US5443499A (en) * 1993-01-14 1995-08-22 Meadox Medicals, Inc. Radially expandable tubular prosthesis
US5735290A (en) * 1993-02-22 1998-04-07 Heartport, Inc. Methods and systems for performing thoracoscopic coronary bypass and other procedures
US5792998A (en) * 1993-04-19 1998-08-11 Cabot Safety Intermediate Corporation Acoustical hearing protective devices utilizing dynamically stiff foam and methods of producing same
US5716410A (en) * 1993-04-30 1998-02-10 Scimed Life Systems, Inc. Temporary stent and method of use
US5514178A (en) * 1993-06-24 1996-05-07 Synthelabo Prosthesis for bodily canal
US5425765A (en) * 1993-06-25 1995-06-20 Tiefenbrun; Jonathan Surgical bypass method
US5618301A (en) * 1993-10-07 1997-04-08 Angiomed Ag Reducing stent, device with reducing stent and use of a reducing stent
US5639278A (en) * 1993-10-21 1997-06-17 Corvita Corporation Expandable supportive bifurcated endoluminal grafts
US5632772A (en) * 1993-10-21 1997-05-27 Corvita Corporation Expandable supportive branched endoluminal grafts
US5723004A (en) * 1993-10-21 1998-03-03 Corvita Corporation Expandable supportive endoluminal grafts
US6165212A (en) * 1993-10-21 2000-12-26 Corvita Corporation Expandable supportive endoluminal grafts
US5545220A (en) * 1993-11-04 1996-08-13 Lipomatrix Incorporated Implantable prosthesis with open cell textured surface and method for forming same
US5733325A (en) * 1993-11-04 1998-03-31 C. R. Bard, Inc. Non-migrating vascular prosthesis and minimally invasive placement system
US5693088A (en) * 1993-11-08 1997-12-02 Lazarus; Harrison M. Intraluminal vascular graft
US5562724A (en) * 1993-12-15 1996-10-08 William Cook Europe A/S Endovascular graft prosthesis and an implantation method for such a prosthesis
US5476506A (en) * 1994-02-08 1995-12-19 Ethicon, Inc. Bi-directional crimped graft
US5609627A (en) * 1994-02-09 1997-03-11 Boston Scientific Technology, Inc. Method for delivering a bifurcated endoluminal prosthesis
US5584885A (en) * 1994-04-28 1996-12-17 Seckel; Brooke R. Nerve regeneration chamber
US5556426A (en) * 1994-08-02 1996-09-17 Meadox Medicals, Inc. PTFE implantable tubular prostheses with external coil support
US5653743A (en) * 1994-09-09 1997-08-05 Martin; Eric C. Hypogastric artery bifurcation graft and method of implantation
US5545210A (en) * 1994-09-22 1996-08-13 Advanced Coronary Technology, Inc. Method of implanting a permanent shape memory alloy stent
US5507769A (en) * 1994-10-18 1996-04-16 Stentco, Inc. Method and apparatus for forming an endoluminal bifurcated graft
US5632763A (en) * 1995-01-19 1997-05-27 Cordis Corporation Bifurcated stent and method for implanting same
US5662675A (en) * 1995-02-24 1997-09-02 Intervascular, Inc. Delivery catheter assembly
US5617878A (en) * 1996-05-31 1997-04-08 Taheri; Syde A. Stent and method for treatment of aortic occlusive disease
US5676697A (en) * 1996-07-29 1997-10-14 Cardiovascular Dynamics, Inc. Two-piece, bifurcated intraluminal graft for repair of aneurysm
US5799658A (en) * 1996-08-15 1998-09-01 Cabot Safety Intermediate Corporation Hearing protective device comprising a foam and a porous component and method of manufacture thereof
US5843166A (en) * 1997-01-17 1998-12-01 Meadox Medicals, Inc. Composite graft-stent having pockets for accomodating movement
US5851232A (en) * 1997-03-15 1998-12-22 Lois; William A. Venous stent
US6214040B1 (en) * 1997-10-20 2001-04-10 Iowa-India Investments Company Limited Sandwich stent with spiraling bands on an outer surface
US6168619B1 (en) * 1998-10-16 2001-01-02 Quanam Medical Corporation Intravascular stent having a coaxial polymer member and end sleeves
US6427800B1 (en) * 1999-11-03 2002-08-06 Dalloz Safety Ab Ear plug and method of manufacturing an ear plug
US6105715A (en) * 1999-11-05 2000-08-22 Aearo Company Multi-color variably attenuating earplug
US6364052B1 (en) * 2000-03-14 2002-04-02 Ivan Mclean, Inc. Earplugs with surface ornamentation
US20030029458A1 (en) * 2001-08-10 2003-02-13 Jim Tlemens Multiple earplug arrangement
US20030029459A1 (en) * 2001-08-10 2003-02-13 Jim Tiemens Earplug with stiffener
US20030029460A1 (en) * 2001-08-10 2003-02-13 Jim Tiemens Extruded earplug

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004021941A1 (en) * 2002-09-06 2004-03-18 Cabot Safety Intermediate Corporation Earplug and method manufacturing an earplug
US20040079579A1 (en) * 2002-10-28 2004-04-29 Barwacz Robert Franciszek Corded hearing protective device and method of manufacturing the same
US8708091B2 (en) * 2002-10-28 2014-04-29 3M Innovative Properties Company Corded hearing protective device and method of manufacturing the same
US9155661B2 (en) 2002-10-28 2015-10-13 3M Innovative Properties Company Corded hearing protective device and method of manufacturing the same
US7192544B2 (en) 2003-09-12 2007-03-20 Howard Leight Industries, Llc Earplug with molded-in stiffener
US20050056289A1 (en) * 2003-09-12 2005-03-17 Jenkins John Allen Earplug with bendable stiffener
US7220372B2 (en) 2004-12-01 2007-05-22 Howard Leight Industries, Llc Dual density earplug
US20060118124A1 (en) * 2004-12-01 2006-06-08 Edwin Woo Dual density earplug
US7984716B2 (en) 2007-06-22 2011-07-26 Kimberly-Clark Worldwide Inc. Self-conforming sound attenuation earplug
US20080314393A1 (en) * 2007-06-22 2008-12-25 Ricky Wayne Purcell Self-conforming sound attenuation earplug
US8113207B2 (en) 2008-08-22 2012-02-14 Kimberly-Clark Worldwide, Inc. Self-conforming sound attenuation earplug
US20100119076A1 (en) * 2008-11-12 2010-05-13 The Timao Group, Inc. Hearing Protection Device Ear Seal With Acoustic Barrier
US20140233753A1 (en) * 2013-02-11 2014-08-21 Matthew Waldman Headphones with cloud integration

Also Published As

Publication number Publication date
MXPA03004735A (en) 2004-05-04
BR0115887A (en) 2003-12-09
DE60132617D1 (en) 2008-03-13
US20060141083A1 (en) 2006-06-29
US7731487B2 (en) 2010-06-08
ZA200304088B (en) 2003-12-10
PT1339364E (en) 2008-04-08
NO20032397D0 (en) 2003-05-27
EP1339364B1 (en) 2008-01-23
EP1339364A1 (en) 2003-09-03
JP2004520874A (en) 2004-07-15
DE60132617T2 (en) 2009-01-29
AU1787502A (en) 2002-06-11
AT384509T (en) 2008-02-15
US20060138691A1 (en) 2006-06-29
US7727433B2 (en) 2010-06-01
DK1339364T3 (en) 2008-05-13
CA2430121A1 (en) 2002-06-06
BR0115887B1 (en) 2011-10-18
NO20032397A (en) 2003-07-25
WO2002043633A1 (en) 2002-06-06
ES2300387T3 (en) 2008-06-16

Similar Documents

Publication Publication Date Title
US3602654A (en) Hydraulically expandable earpiece
CA2065449C (en) Ear piece having disposable, compressible polymeric foam sleeve
US3211143A (en) Mouth protector
US6264870B1 (en) Earplug
US4674134A (en) Earmuff having sealing ring including liquid and foam plastic layers
US5107861A (en) Safe ear clean button and protection with attachment device
US5917918A (en) In-ear-canal audio receiver and stethoscope having the same
JP2752069B2 (en) Hearing aid device and its sleeve
US4253452A (en) Ear plug assembly
US7648005B2 (en) Clip-style hearing protector
US5746221A (en) Cold formable mouthguards
CN101541272B (en) Self-fitting device for location in an ear canal
US6408981B1 (en) Extruded monolithic foam earplug
KR101229747B1 (en) Oral appliance
US6936023B2 (en) Composite ventilation tube
US9571912B2 (en) Deformable ear tip for earphone and method therefor
JP4125127B2 (en) Expandable ear canal equipment
US7201678B2 (en) Sports equipment handle with cushion and grip ribs
US7913696B2 (en) Self-fitting device for location in an ear canal
EP1596790B1 (en) Conforming earplug
US4949457A (en) Soft resilient razor handle
US5957136A (en) Earplug
AU2008269453B2 (en) Self-conforming sound attenuation earplug
JP4143939B2 (en) How to attenuate selectively sound in hearing protection earplug and the earplug
GB1140290A (en) Making earplugs for hearing aids

Legal Events

Date Code Title Description
AS Assignment

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION, DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KNAUER, RICHARD;SEVILLE, ALAN R.;FALCO, ROBERT N.;AND OTHERS;REEL/FRAME:013009/0207;SIGNING DATES FROM 20011205 TO 20020211

AS Assignment

Owner name: DEUTSCHE BANK AG, NEW YORK BRANCH, NEW YORK

Free format text: SECURITY AGREEMENT;ASSIGNOR:CABOT SAFETY INTERMEDIATE CORPORATION;REEL/FRAME:015293/0386

Effective date: 20040420

Owner name: DEUTSCHE BANK AG, NEW YORK BRANCH,NEW YORK

Free format text: SECURITY AGREEMENT;ASSIGNOR:CABOT SAFETY INTERMEDIATE CORPORATION;REEL/FRAME:015293/0386

Effective date: 20040420

AS Assignment

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION, NORTH CAROL

Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:DEUTSCHE BANK AG, NEW YORK BRANCH;REEL/FRAME:017626/0347

Effective date: 20060324

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION,NORTH CAROLI

Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:DEUTSCHE BANK AG, NEW YORK BRANCH;REEL/FRAME:017626/0347

Effective date: 20060324

AS Assignment

Owner name: BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AG

Free format text: SECURITY AGREEMENT;ASSIGNOR:CABOT SAFETY INTERMEDIATE CORPORATION;REEL/FRAME:017435/0721

Effective date: 20060324

Owner name: BANK OF AMERICA, N.A., AS SECOND LIEN COLLATERAL A

Free format text: SECURITY AGREEMENT;ASSIGNOR:CABOT SAFETY INTERMEDIATE CORPORATION;REEL/FRAME:017435/0764

Effective date: 20060324

AS Assignment

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION, NORTH CAROL

Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:DEUTSCHE BANK AG, NEW YORK BRANCH;REEL/FRAME:017663/0508

Effective date: 20060324

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION,NORTH CAROLI

Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:DEUTSCHE BANK AG, NEW YORK BRANCH;REEL/FRAME:017663/0508

Effective date: 20060324

AS Assignment

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION, DELAWARE

Free format text: RELEASE OF FIRST LIEN SECURITY INTEREST AT REEL/FRAME NO. 17435/0721;ASSIGNOR:BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT;REEL/FRAME:019511/0914

Effective date: 20070601

Owner name: BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AG

Free format text: GRANT OF FIRST LIEN SECURITY INTEREST IN UNITED STATES PATENTS AND TRADEMARKS;ASSIGNOR:CABOT SAFETYINTERMEDIATE CORPORATION;REEL/FRAME:019520/0001

Effective date: 20070601

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION,DELAWARE

Free format text: RELEASE OF FIRST LIEN SECURITY INTEREST AT REEL/FRAME NO. 17435/0721;ASSIGNOR:BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT;REEL/FRAME:019511/0914

Effective date: 20070601

AS Assignment

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION, DELAWARE

Free format text: RELEASE OF FIRST LIEN SECURITY INTEREST AT REEL/FRAME NO. 19520/0001;ASSIGNOR:BANK OF AMERICA, N.A.;REEL/FRAME:020733/0440

Effective date: 20080401

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION, DELAWARE

Free format text: RELEASE OF SECOND LIEN SECURITY INTEREST AT REEL/FRAME NO. 17435/0764;ASSIGNOR:BANK OF AMERICA, N.A.;REEL/FRAME:020733/0510

Effective date: 20080401

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION,DELAWARE

Free format text: RELEASE OF SECOND LIEN SECURITY INTEREST AT REEL/FRAME NO. 17435/0764;ASSIGNOR:BANK OF AMERICA, N.A.;REEL/FRAME:020733/0510

Effective date: 20080401

Owner name: CABOT SAFETY INTERMEDIATE CORPORATION,DELAWARE

Free format text: RELEASE OF FIRST LIEN SECURITY INTEREST AT REEL/FRAME NO. 19520/0001;ASSIGNOR:BANK OF AMERICA, N.A.;REEL/FRAME:020733/0440

Effective date: 20080401