US3719954A - Head set construction - Google Patents

Head set construction Download PDF

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Publication number
US3719954A
US3719954A US00010787A US3719954DA US3719954A US 3719954 A US3719954 A US 3719954A US 00010787 A US00010787 A US 00010787A US 3719954D A US3719954D A US 3719954DA US 3719954 A US3719954 A US 3719954A
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US
United States
Prior art keywords
headband
earcup
stud
washers
pair
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.)
Expired - Lifetime
Application number
US00010787A
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English (en)
Inventor
F Beguin
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.)
Aearo Technologies LLC
Original Assignee
American Optical Corp
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Filing date
Publication date
Application filed by American Optical Corp filed Critical American Optical Corp
Application granted granted Critical
Publication of US3719954A publication Critical patent/US3719954A/en
Assigned to AO,INC. A CORP OF DE. reassignment AO,INC. A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN OPTICAL CORPORATION
Assigned to WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP. reassignment WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP. CONDITIONAL ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: AO, INC. A DE CORP.
Assigned to WARNER-LAMBERT CANADA, INC., WARNER-LAMBERT TECHNOLOGIES, INC. reassignment WARNER-LAMBERT CANADA, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AO, INC., A DE CORP.
Assigned to IRVING TRUST COMPANY reassignment IRVING TRUST COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AO, INC.
Assigned to AMERICAN OPTICAL CORPORATION, A CORP. OF reassignment AMERICAN OPTICAL CORPORATION, A CORP. OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AO, INC., A DE. CORP., IRVING TRUST COMPANY, A NY CORP., WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP.
Assigned to IRVING TRUST COMPANY reassignment IRVING TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN OPTICAL CORPORATION, RADIAC ABRASIVES (EAST) INC., RADIAC ABRASIVES (WEST) INC.
Anticipated expiration legal-status Critical
Assigned to AO, INC., A DE CORP. reassignment AO, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN OPTICAL CORPORATION
Assigned to CABOT SAFETY CORPORATION reassignment CABOT SAFETY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AO, INC.
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
    • A61F11/06—Protective devices for the ears
    • A61F11/14—Protective devices for the ears external, e.g. earcaps or earmuffs

Definitions

  • ABSTRACT Headset construction including headband and earcups having connecting means therebetween allowing smooth dampened swivelling action of earcups into desired close-fitting positions against wearer's head and about his ears and with said connecting means arranged to allow headband to be readily adjusted to different lengths and pivoted relative to earcups so as to be worn in any one of several different positions as conditions of use require,
  • This invention relates to improvements in headset constructions for ambient sound attenuation, and more particularly to a headset construction comprising a headband and a pair of earcups having improved connecting means therebetween for allowing each earcup to be smoothly universally swivelled into any desired position of use against the wearers head and in closefitting relation about the wearers ears while also allowing the headband to be adjusted in length, as required, and moved into and retained in any one of several different operative positions during use of the headset.
  • the headset comprises a flexible headband and a pair of earcups which are swivelly carried upon opposite end portions of the flexible headband by improved connecting means which is of such construction and arrangement as to provide smooth firm frictional sliding resistance to the movable parts of the structure as well as allow the wearer of the headset to easily and readily adjust each earcup into its proper position surrounding the wearers ear and bearing in close-fitting condition against the wearers head.
  • the connecting means construction and arrangement is such that the flexible headband may be readily adjusted as needed without requiring the tightening or loosening of parts, to position the headband over the head, or under the chin, or even in back of the head near the wearers neck as desired.
  • the built-in frictional resistance of the adjustable parts of the structure is such that it will thereafter tend to retain the headband in such adjusted position unless forcefully disturbed or purposely manipulated; and this built-in frictional resistance will remain substantially constant even though the parts are pivoted many hundreds of times during the use thereof.
  • the improved connecting means mentioned above between each earcup and an end portion of the headband and providing the so-called built-in frictional resistance includes ball-and-socket means which has been so carefully controlled during the production thereof as to size of parts and physical characteristics of materials employed that not only will smooth sliding action of the parts be had over long periods of use but also it will be such that the amount of frictional resistance desired will be provided and will be maintained substantially constant.
  • ball-and-socket means which has been so carefully controlled during the production thereof as to size of parts and physical characteristics of materials employed that not only will smooth sliding action of the parts be had over long periods of use but also it will be such that the amount of frictional resistance desired will be provided and will be maintained substantially constant.
  • the controlled character and arrangement of the parts and the smooth firm frictional resistance provided is such that the headband may be easily adjusted lengthwise for different conditions requiring different distances between the earcups carried near the opposite ends thereof.
  • the improved construction comprises adjustable slidable connecting means which is such that said headset may be readily adapted to fit any one of a wide range of different size requirements for different conditions of use.
  • an object of the present invention to provide an improved headset comprising a flexible headband and a pair of earcups carried near the opposite ends of said headband by connecting means which is of such improved construction and arrangement that each earcup may be universally swivelled suitable amounts in any direction with reference to said headband in order to allow the earcup to fit about the wearers ears and evenly and snugly against the wearers head, and which earcups may each be rotated as desired about its central axis for fitting purposes.
  • the connecting means allows the headband to be pivoted as desired into any one of its several normal operative positions above, in front of or to the rear of the wearers head and firmly frictionally retained in any such operative position during use thereof.
  • the headband and earcups will normally be retained in their adjusted positions during normal use of the equipment and, on the other hand, the earcups may be readily forcefully pressed, without the loosening or tightening of any parts, into any other position of adjustment desired.
  • FIG. 1 is a perspective view of a headset embodying the present invention
  • FIG. 2 is an enlarged fragmentary view of a part of the structure of FIG. 1;
  • FIG. 3 is a transverse sectional view taken substantially upon section line 3-3 of FIG. 2 and looking in the direction of the arrows;
  • FIG. 4 is an exploded view of the parts of the structure of FIG. 3;
  • FIG. 5 is a fragmentary side elevational view showing a modified form of the invention. 7
  • FIG. 6 is a vertical sectional view taken substantially along section line 6-6 of FIG. 5;
  • FIG. 7 is a vertical sectional view showing complementary mold parts for use in carrying out method steps of the present invention.
  • a headset comprising a resilient or spring-type headband l2 and a pair of earcups 14 carried thereby.
  • the connecting means for this purpose will be later described.
  • the headband would be formed of flat spring steel, stiff plastic, fiber glass or the like of such characteristics as to afford the firm but yieldable pressure desired between the earcups and the opposite sides of the wearer's head while in use.
  • Each earcup is of a hollow one-piece construction and formed of a moldable plastic material.
  • the earcup comprises an outer generally circular wall portion 14a peripherally connected to an endless side portion 14b of frusto-conical shape.
  • the molded earcup is open at its inner side but may be provided with a small endless flange at its inner edge arranged to receive andhelp retain the outer thin flange of a flexible head-engaging resilient ear pad or cushion 16 in overlapping engagement with this peripheral flange.
  • the cushion is provided centrally therein with an elongated opening 18 of suitable size and shape for receiving the ear of the wearer therein.
  • a pair of front and rear flattened portions 20 are formed upon the outer surface of the wall portion 14b of each earcup in order to enable the wearer to easily feel and determine thereby the position of the earcup opening 18 without having to remove the headset.
  • each earcup Carried in the outer wall portion 14a of each earcup is a ball-headed stud 22 formed of metal, (see also FIGS. 2 and 3) which has its polished sphericallyshaped head portion 22a embedded within he plastic of the earcup during the molding thereof.
  • the head portion 22a is permanently contained within and firmly gripped by the plastic forming a socket 25 in the molded plastic materialof the outer wall portion 14b at an enlarged thickened central region 24 thereof.
  • the molded plastic-material about the stem portion 22b of the stud 22 is recessed at 27 in such a manner that limited universal pivotal movement of the stud about the geometric center of the ball-headed part 22a and relative to the earcup may be accomplished.
  • the allowable pivotal movement of the stud in any direction from its centered position would be, in most cases, an angular amount approximating 15 to 20.
  • the stem portion 22b of the ball-headed stud 22, as shown in FIG. 3, is arranged to extend outwardly through an elongated slot 38 formed in an end portion 12a of the headband 12 and through a pair of friction washers 30 and 32, preferably formed of a plastic, like nylon or teflon, disposed at opposite sides of the slotted end portion 12a.
  • the outer end 22a of the stud of FIG. 3 is threaded to receive an adjustable stop-nut 34 and a spring washer is located between this nut and outer friction washer 32. This nut 34 can be easily adjusted to exert the amount of clamping action needed between the friction washers 30, 32 and the slotted end portion to prevent unwanted longitudinal sliding action therebetween.
  • a small pin 42 is provided (see FIG. 4) and arranged to extend through a bore 44 in the stud in such a way as to have engagement with a groove 46 provided in an upstanding collar portion 48 of inner washer 30.
  • an integral rectangular projecting rib 30a is formed on the inner side of washer 30 and is arranged to project outwardly sufficiently to extend through the slot 38 in headband l2 and into an elongated rectangular groove 32a formed in the inner wall of washer 32.
  • the headband may be the wish of a person servicing a jet aircraft to wear his headset for sound-attenuation purposes with the headband extending over the head, and thereafter he may wish to swing the headband into a position lying closely adjacent the nape of his neck, such as when a cap or protective helmet is also to be used, or he may wish to swing the headband to a position under his chin and such uses of the device, while in service may be readily and smoothly accomplished by merely exerting a firm pressure upon the headband.
  • FIGS. 5 and 6 a somewhat modified form of the invention is shown.
  • a headband which has only one of its opposite end portions shown at end Each nd portion, it will be understood, is stamped or otherwise formed so as to be more or less of a spoon-shaped formation with the concave side thereof facing inwardly.
  • a ball-headed stud 122 (like stud 22 in FIGS. 1-4) has its spherically-shaped inner end 122a embedded, during the earcup molding operation, in the plastic wall of the earcup 14 and so as to have limited universal swivelling motion as mentioned before, but, on the otherhand, hasits stem portion 122b slightly modified.
  • This stem portion 122b is straightsided and may be arranged, for example, to extend into a centered hole in the spoon-shaped central portion of the end and there securely rigidly connected to the central portion as by welding, riveting, peening or the like for effecting a firm mechanical connection.
  • the ends of the headband will more or less hood-in the connecting means for the earcups.
  • the same universal swivelling and pivotal motion of the earcups will be provided.
  • an adjustable extensible arrangement for the headband intermediate the opposite ends In such case, the headband would preferably have two semi-circular halves slidably related to each other and held together by a polyvinyl chloride channel, in known manner.
  • the length of the headband may be changed readily as required.
  • each earcup may be swivelled or rotated into any one of its many different positions of adjustments and the headband may be easily and readily pivoted about the two ball-headed end portions of the studs embedded within the earcups into any position desired by the wearer merely by pressing on the headband.
  • the smooth firm frictional engagement provided by the ball-headed studs within the earcup cavities will still be present and provide a firm gripping action sufficient to ordinarily retain the headband in any given operation position.
  • the earcups are formed of any one of a number of well-known rigid thermoplastic or thermosetting materials by an injection molding process which embeds the spherically shaped end of the supporting studs 22 within the plastic material but, nevertheless, provides a firm gripping action of the ball portion thereof while also allowing desired dampened pivotal, universal swivelling and rotational movements therebetween. Furthermore, the amount of resistance to such motion may be easily and accurately controlled. Also, the construction is such that the joints so formed in the plastic material are self-lubricating and will remain substantially free from any penetration of dirt, dust or the like.
  • Each earcup is formed between complementary pairs of molds members recessed to provide a mold cavity within which is placed before the mold parts are closed the mounting stud 22 in such a manner that the greater part of the ball-headed portion thereof will become permanently embedded in the plastic material while, nevertheless, having the stem portion thereof remain free of the plastic and thus free to move relative thereto the desired or in any direction from its centered position.
  • FIG. 7 two mold halves 131 and 133 are shown in engaging position ready to receive the plastic material for forming a molded earcup.
  • the mold half 131 is provided with a finished formed surface 131a of predetermined desired size and shape and the mold half 133 is provided with finished mold surface 133a of a different predetermined complementary size and shape.
  • These surfaces are suitably related so as to effect therebetween a mold cavity 135 of proper proportions for forming earcups like that shown at 14 in FIG. 1.
  • a recessed portion 136 extends about the edge of the mold half 133 in such a way as to form a small peripheral retaining flange upon the finished earcup for aiding in engagement with the ear cushion 16 when same is later in place upon the earcup.
  • a gate and passageway for the injection of the plastic are shown at 145.
  • a tubular insert 137 Centrally of the mold half 133 is provided a tubular insert 137 which has a recessed upper surface 138 suitably shaped and arranged for forming the thickened central portion 24 on the outer wall 14a of the molded earcup (see FIG. 3) with the ball-headed end of the stud embedded therein.
  • the tubular insert 137 is provided with a central bore 141 for receiving the stem portion of a stud each time an earcup is to be formed and before the mold members are closed for injection purposes.
  • the ball-headed part 22a rests upon a small upstanding collar 143 formed on the tubular insert so that the greater part of the ball-headed portion will be exposed within the mold cavity 135.
  • the result is that the recess 27, indicated in FIG. 3, will be formed about the stem portion 22b for allowing the universal pivotal action of the stud mentioned above.
  • the size and thickness of the central part 24 of the earcup is such as to conveniently accommodate the enlarged polished ball-headed end portion 220 of the stud 22 (or 122a of stud 122) as the case may be.
  • Flowable plastic material may be injected into the mold cavity in known manner though conduit means not shown and at such time air will be allowed to escape through ports or ducts in the mold part, likewise not shown.
  • the mold cavity surfaces are so shaped as to provide easy separation of the halves and easy removal of the cup as well as the stud 22.
  • the frictional dampening resistance to swivelling action may be increased and easily controlled in amount by a change in the diameter of the ball-headed end of the stud to be used.
  • a small increase in the diameter of the ball-headed end will provide a relatively large increase in the amount of sliding areas being gripped and a large in crease in the frictional resistance provided the construction.
  • the total frictional areas involved in any instance would be substantially equal to 4-rrr and thus doubling the diameter of the ball, for example, would result in at least a four-fold increase in torque required to rotate the stud.
  • a headset comprising a flexible headband having opposite end portions, a pair of sound-attenuating earcups carried by said headband adjacent said opposite end portions thereof, each earcup being formed of rigid molded plastic material and having a solid outer wall peripherally integrally connected to an endless surrounding solid side wall, each side wall in turn carrying upon all parts of its endless inner edge a centrally apertured flexible head-engaging cushion so as to define with its earcup an enclosed sound-attenuating air space when each earcup is positioned against the wearer's head, and connecting means securing each of said earcups to said headband opposite end portions, each connecting means comprising a metallic stud secured to one of said headband end portions and having a smooth enlarged spherically-shaped inner end, a socket formed in the solid outer plastic wall portion of the earcup adjacent thereto, the major portion of said enlarged inner end being permanently embedded within said socket the rigid plastic material forming said socket providing a firm gripping action upon said spherically-shaped inner end which is such
  • annular recess is formed in the plastic of said earcup around said stud adjacent the spherically-shaped inner end thereof, said recess being of such size as to allow universal swivelling action of said earcup about said spherically-shaped inner end a limited angular amount in any desired direction from its normal centered position.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Acoustics & Sound (AREA)
  • Biophysics (AREA)
  • Otolaryngology (AREA)
  • Psychology (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Headphones And Earphones (AREA)
  • Telephone Set Structure (AREA)
  • Pivots And Pivotal Connections (AREA)
US00010787A 1970-02-12 1970-02-12 Head set construction Expired - Lifetime US3719954A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1078770A 1970-02-12 1970-02-12

Publications (1)

Publication Number Publication Date
US3719954A true US3719954A (en) 1973-03-13

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US00010787A Expired - Lifetime US3719954A (en) 1970-02-12 1970-02-12 Head set construction

Country Status (6)

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US (1) US3719954A (de)
JP (1) JPS5327597B1 (de)
CA (1) CA926787A (de)
DE (1) DE2105292A1 (de)
FR (1) FR2078583A5 (de)
GB (1) GB1340923A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030037366A1 (en) * 2000-02-15 2003-02-27 Mats Lindgren Hearing protection device
US6611963B2 (en) 2001-10-26 2003-09-02 Bacon Usa Safety, Inc. Wire band earmuff
US20040065332A1 (en) * 2001-02-01 2004-04-08 Mats Lindgren Method for producing a hearing protection cup, and tool used for its production
US20100281605A1 (en) * 2009-05-06 2010-11-11 Pereira Jorge Miguel Ear muffs
US20110209273A1 (en) * 2008-08-25 2011-09-01 Loud & Clear Safety Pty Ltd Safety Apparatus
WO2018148705A1 (en) * 2017-02-13 2018-08-16 Otto Engineering, Inc. Headset mounts
CN109361986A (zh) * 2018-12-12 2019-02-19 歌尔科技有限公司 头戴耳机滑动调节结构和头戴耳机
CN110270813A (zh) * 2019-07-29 2019-09-24 浙江大学 一种劳保耳机装配系统
US11218790B2 (en) * 2015-07-16 2022-01-04 Voyetra Turtle Beach, Inc. Headset with internal gimbal

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE412517B (sv) * 1976-09-30 1980-03-10 Gullfiber Ab Horselskydd med tva horselskyddskapor, monterade vid en kapbygel
JPS54167998U (de) * 1978-05-18 1979-11-27
US4471496A (en) * 1983-06-27 1984-09-18 Cabot Corporation Articulated earmuff-to-headband attachment construction
SE463803B (sv) * 1988-04-28 1991-01-28 Milmas Ab Fjaedrande monteringsarm foer hoerselskydd
AU728919B2 (en) * 1996-08-15 2001-01-18 Cabot Safety Intermediate Corporation A device having rotatable legs
GB2339642B (en) * 1998-07-15 2000-07-05 Cotron Corp Earphone-microphone-earmuff-assembly

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437748A (en) * 1945-06-11 1948-03-16 Chicago Eye Shield Company Adjustable headband construction
US2505684A (en) * 1944-03-09 1950-04-25 Francis H Mcclernon Toolholder
US2506981A (en) * 1946-10-25 1950-05-09 Lawrence G Weaver Air conduction hearing aid having adjacently mounted microphone and receiver
FR1145964A (fr) * 1954-05-20 1957-11-05 Ca Nat Research Council Protège-tympans
US2858544A (en) * 1956-05-04 1958-11-04 Mine Safety Appliances Co Noise attenuating device
US3108282A (en) * 1958-09-30 1963-10-29 Rehman Irving Ear defender positioning and mounting apparatus
US3461463A (en) * 1967-06-09 1969-08-19 American Optical Corp Ear protector suspension devices and the combination with headgear

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505684A (en) * 1944-03-09 1950-04-25 Francis H Mcclernon Toolholder
US2437748A (en) * 1945-06-11 1948-03-16 Chicago Eye Shield Company Adjustable headband construction
US2506981A (en) * 1946-10-25 1950-05-09 Lawrence G Weaver Air conduction hearing aid having adjacently mounted microphone and receiver
FR1145964A (fr) * 1954-05-20 1957-11-05 Ca Nat Research Council Protège-tympans
US2858544A (en) * 1956-05-04 1958-11-04 Mine Safety Appliances Co Noise attenuating device
US3108282A (en) * 1958-09-30 1963-10-29 Rehman Irving Ear defender positioning and mounting apparatus
US3461463A (en) * 1967-06-09 1969-08-19 American Optical Corp Ear protector suspension devices and the combination with headgear

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030037366A1 (en) * 2000-02-15 2003-02-27 Mats Lindgren Hearing protection device
US6678897B2 (en) * 2000-02-15 2004-01-20 Ab Kompositprodukter Vikmanshyttan Hearing protection device
US20040065332A1 (en) * 2001-02-01 2004-04-08 Mats Lindgren Method for producing a hearing protection cup, and tool used for its production
US6854466B2 (en) * 2001-02-01 2005-02-15 Ab Kompositprodukter Vikmanshyttan Method for producing a hearing protection cup, and tool used for its production
US6611963B2 (en) 2001-10-26 2003-09-02 Bacon Usa Safety, Inc. Wire band earmuff
US20110209273A1 (en) * 2008-08-25 2011-09-01 Loud & Clear Safety Pty Ltd Safety Apparatus
US8732864B2 (en) 2008-08-25 2014-05-27 Loud & Clear Safety Pty Ltd Safety apparatus
US20100281605A1 (en) * 2009-05-06 2010-11-11 Pereira Jorge Miguel Ear muffs
US20220095031A1 (en) * 2015-07-16 2022-03-24 Voyetra Turtle Beach, Inc. Headset with internal gimbal
US11218790B2 (en) * 2015-07-16 2022-01-04 Voyetra Turtle Beach, Inc. Headset with internal gimbal
US11683627B2 (en) * 2015-07-16 2023-06-20 Voyetra Turtle Beach, Inc. Headset with internal gimbal
US20230276158A1 (en) * 2015-07-16 2023-08-31 Voyetra Turtle Beach, Inc. Headset with internal gimbal
WO2018148705A1 (en) * 2017-02-13 2018-08-16 Otto Engineering, Inc. Headset mounts
CN109361986A (zh) * 2018-12-12 2019-02-19 歌尔科技有限公司 头戴耳机滑动调节结构和头戴耳机
CN110270813A (zh) * 2019-07-29 2019-09-24 浙江大学 一种劳保耳机装配系统
CN110270813B (zh) * 2019-07-29 2023-12-26 浙江大学 一种劳保耳机装配系统

Also Published As

Publication number Publication date
FR2078583A5 (de) 1971-11-05
GB1340923A (en) 1973-12-19
CA926787A (en) 1973-05-22
DE2105292A1 (de) 1971-08-19
JPS5327597B1 (de) 1978-08-09

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Owner name: AO,INC.SOUTHBRIDGE, MASS. A CORP OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN OPTICAL CORPORATION;REEL/FRAME:004056/0229

Effective date: 19820513

Owner name: WARNER-LAMBERT TECHNOLOGIES, INC., A TX CORP.

Free format text: CONDITIONAL ASSIGNMENT;ASSIGNOR:AO, INC. A DE CORP.;REEL/FRAME:004041/0934

Effective date: 19820528

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Free format text: SECURITY INTEREST;ASSIGNOR:AO, INC., A DE CORP.;REEL/FRAME:004073/0046

Effective date: 19820528

Owner name: WARNER-LAMBERT TECHNOLOGIES, INC., A DE CORP.

Free format text: SECURITY INTEREST;ASSIGNOR:AO, INC., A DE CORP.;REEL/FRAME:004073/0046

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AO, INC.;REEL/FRAME:004073/0675

Effective date: 19820621

Owner name: IRVING TRUST COMPANY, ONE WALL ST, NEW YORK, N.Y.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AO, INC. A CORP. OF DEL.;REEL/FRAME:004073/0675

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Owner name: AMERICAN OPTICAL CORPORATION, A CORP. OF DE.

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Owner name: IRVING TRUST COMPANY

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