WO2021205217A1 - Demi-masque réutilisable transparent coloré pour usage médical et personnel - Google Patents

Demi-masque réutilisable transparent coloré pour usage médical et personnel Download PDF

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Publication number
WO2021205217A1
WO2021205217A1 PCT/IB2020/054096 IB2020054096W WO2021205217A1 WO 2021205217 A1 WO2021205217 A1 WO 2021205217A1 IB 2020054096 W IB2020054096 W IB 2020054096W WO 2021205217 A1 WO2021205217 A1 WO 2021205217A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
protective equipment
carcass
anterior part
equipment according
Prior art date
Application number
PCT/IB2020/054096
Other languages
English (en)
Inventor
Giovanni Gallo
Walter Castrogiovanni
Original Assignee
Imask S.R.L.
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
Application filed by Imask S.R.L. filed Critical Imask S.R.L.
Publication of WO2021205217A1 publication Critical patent/WO2021205217A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A41D13/1107—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape
    • A41D13/1138—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a cup configuration
    • A41D13/1146—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a cup configuration obtained by moulding
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02—Masks
    • A62B18/025—Halfmasks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1692—Other shaped material, e.g. perforated or porous sheets
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A41D13/1161—Means for fastening to the user's head
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A41D13/1192—Protective face masks, e.g. for surgical use, or for use in foul atmospheres with antimicrobial agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0654—Support layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0668—The layers being joined by heat or melt-bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1208—Porosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1216—Pore size

Definitions

  • the present invention concerns personal protective equipment (PPE) for protection of the respiratory tract, with particular innovative characteristics in terms of production and use thereof .
  • PPE personal protective equipment
  • PPE personal protective equipment
  • face masks Said pieces of PPE are commonly referred to as "face masks" can be substantially divided into two categories:
  • Equipment in which the structure itself or the carcass is the filtering element, therefore the equipment is manufactured by assembling the filtering element through seams or heat welding. Said equipment may or may not be provided with a valve which opens due to the pressure difference generated when the wearer exhales. Said equipment is for the most part considered disposable, since it is subject to wear and becomes clogged in the course of a few hours; furthermore, since it is provided with said outlet valves it allows the spread of viruses, bacteria etc. through the breath of a person who may be infected. Moreover, it is not perfectly ergonomic, particularly at the face between bridge of the nose, lower eyelid and mid cheek.
  • the filtering materials currently used for the production of PPE are able to filter, and therefore retain, only particles larger than approximately 0.4 micron and, only in the case of electrostatic filters, up to 0.2 micron; these values allow the passage of smaller particles, for example viruses.
  • One object of the present invention is to solve or at least alleviate the problems described above.
  • a further object of the invention is to simplify the production process to meet the needs of a large number of users.
  • a further object of the invention is to provide personal protective equipment with characteristics substantially transversal to the separate categories of PPE currently on the market. Based on the invention, a personal protective equipment (PPE) is therefore provided as defined in the attached claims.
  • the personal protective equipment comprises a carcass or structure, preferably moulded in one single piece in a synthetic plastic material which is at least partly elastomeric, for example of a silicone type.
  • the carcass or structure is shaped so as to reproduce the shape of the human face and is provided with at least one zone having through micro-holes designed to guarantee the inflow and outflow of air necessary for respiration; preferably, said perforated zone is located in an anterior and centre-line portion of the carcass or structure.
  • a seat is provided designed to house an interchangeable and therefore replaceable filter.
  • a removable cover provided with through holes and lockable in the above-mentioned seat can be inserted from an inner face of the carcass or structure, facing, in use, a user that wears the protective equipment.
  • the removable cover is configured to keep in place the filter, which will be locked between the carcass and the cover.
  • the filter can be obtained integrated in and forming one single piece with the cover which, in this case, will also be replaceable and disposable .
  • Openings for the auricles are located on the sides of the carcass or structure. Furthermore, an adjustable closing system is situated in the rear part of the carcass or structure, which is open to allow the user to put the PPE on easily and the opposite ends of which are preferably configured as a belt or strap, so that they can be interconnected and fastened to each other.
  • the replaceable filter consists of a sheet membrane, for example of rectangular or circular shape and having an extension such that it extends peripherally well beyond the perforated zone and all around it, made of a filtering material with purely mechanical action having nodule and fibril structure, configured to provide in the filter a very twisty section for passage of the air formed of a non-linear succession of empty spaces in a quantity such as to ensure an overall porosity of the filter ranging from 70% to 85% and retain particles up to 0.01 micron.
  • the filter is a membrane made of two-way expanded polytetrafluoroethylene (e-PTFE) sheet.
  • the membrane made of e-PTFE sheet can be laminated on a support and has a thickness ranging from 0.1 to 20 micron.
  • the invention therefore also relates to the use of an e-PTFE membrane as an interchangeable filter for personal protective equipment (PPE) shaped as a half mask that can be applied to a user's face in front of the nose and mouth to retain by pure mechanical action particles suspended in the air having dimensions greater than or equal to 0.01 micron.
  • PPE personal protective equipment
  • the filter as a replacement or in addition to the e-PTFE, a non-woven fabric having the above physical-chemical characteristics.
  • the materials with which the carcass or structure, the filter and the cover are made are all entirely transparent or translucent, coloured or colourless, so that the face of the user wearing the protective equipment can be seen from the outside.
  • Fig.l schematically shows a lateral elevation view of a possible first embodiment of the protective equipment according to the invention
  • FIG. 2 schematically shows the protective equipment of figure 1, in the same lateral elevation view as figure 1 but cut away according to a trace plane II-II (visible in Fig. 5);
  • FIG. 3 schematically shows, on an enlarged scale, a detail of the cutaway lateral view of figure 2 of the protective equipment of the invention
  • Fig. 4 schematically shows, in axonometric view cut away according to the trace plane II-II, an exploded view of the complex of elements composing the protective equipment of figure
  • FIG. 5 schematically shows a frontal elevation view of the protective equipment of figure 1;
  • FIG. 6 schematically shows, in an orthogonal lateral elevation view, a cover forming part of the component elements of the protective equipment as shown in figure 4;
  • FIG. 7 schematically shows, in an orthogonal frontal elevation view, the cover shown in figure 6;
  • FIG. 8 schematically shows, in an orthogonal frontal elevation view, a filter forming part of the component elements of the protective equipment as shown in figure 4;
  • - Fig. 9 schematically shows, frontally in axonometric view, the protective equipment of figure 1 in its entirety and in an open configuration, applied on the head of a user, shown for merely illustrative and non-limiting purposes
  • - Fig. 10 schematically shows, at the rear in axonometric view, the protective equipment of figure 1 in its entirety and in a closed configuration, applied around the profile of a human head of a possible user, shown for merely illustrative and non limiting purposes;
  • FIG. 11 schematically shows a front, overhead and exploded three-quarter axonometric view of a second embodiment of the protective equipment of the invention, illustrating all of the component elements thereof;
  • FIG. 12 schematically shows the same exploded axonometric view as figure 11 but cut away according to a trace plane XII-XII;
  • FIG. 13 illustrates a SEM photograph of the structure of the replaceable filter used in the protective equipment according to the invention.
  • the number 1 indicates, as a whole, a personal protective equipment consisting of a half mask that can be applied to the face of a user in order to protect and cover the mouth and nose, as illustrated in figures 9 and 10.
  • the protective equipment 1 comprises a structure or carcass or base body 2, comprising a cup-shaped anterior part or portion 20 having an anatomical profile, in which a plurality of through holes or micro-holes 3 are provided.
  • the carcass or structure 2 is shaped, at least at the anterior part or portion 20 thereof, so as to reproduce the shape of the human face and has at least a zone 30 provided with the through micro-holes 3 designed to guarantee the inflow and outflow of air necessary for respiration.
  • said perforated zone 30 is located at the anterior portion 20, along the centre-line, so that in use it is in front of the user's mouth and/or nose.
  • Respective opposite bands 21 provided with through openings 4 configured to house the auricles of a user extending in a cantilever fashion from opposite sides of the anterior part 20.
  • the structure or carcass 2 is open at the rear, at its opposite ends 200, so that the protective equipment 1 can be easily put on by a user.
  • the rear ends 200 are defined by the terminal parts or ends of the bands 21, they are opposite to the anterior part or portion 20 and are provided with a size adjustment system or device 5 of any suitable type, for example known per se and illustrated only schematically for the sake of simplicity.
  • the opposite ends 200 are configured as a belt or strap, so as to be interconnected and fastened to each other thanks to the size adjustment system or device 5.
  • the structure or carcass 2 is moulded in one single piece in an at least partly elastomeric synthetic plastic material, for example of a silicone type, or a styrene-based thermoplastic elastomer.
  • an at least partly elastomeric synthetic plastic material for example of a silicone type, or a styrene-based thermoplastic elastomer.
  • the anterior part 20 and the bands 21 with the rear ends 200 and the size adjustment device 5 are obtained integral with each other and in one single piece.
  • the equipment 1 further comprises, advantageously jointed to the structure or carcass 2, at least one interlocking cover 8, also provided with a plurality of holes or micro-holes 3 and at least one filter 7 which is pack- assembled between the anterior part or portion 20, in particular at the perforated zone 30, and the perforated cover 8, which is preferably configured to internally support, in the anterior part thereof, the at least one filter 7.
  • the adjustment system or device 5 operates according to a predefined travel and can be locked at predefined and non- predefined points, thus adapting to various individuals with different cranial circumferences.
  • the at least one cover 8 can be expediently released from the carcass 2 in order to replace the at least one filter 7.
  • the lateral openings 4 expediently furthermore delimit a small strip of material defined by the upper solid part of the bands 21 which rests on the upper part of the auricle guaranteeing a uniform distribution of the weight of the equipment 1.
  • the air inlet and outlet holes 3 located in the anterior part can have many different regular and non-regular geometric shapes and dimensions: circle, hexagon, pentagon, various closed irregular shapes, and said holes can be located in every zone of the anterior part of the equipment and can in turn have a non-unique arrangement.
  • the at least one perforated cover 8 is made of a synthetic plastic material more rigid than the one of which the carcass or structure 2 is made, for example LDPE, and can have any shape and dimension, and any appropriate system for fixing it to the carcass 2 of the equipment 1, on which carcass it couples in a removable manner from the inner part of the carcass 2, in an appropriate seat or housing 6.
  • LDPE low density polyethylene
  • the at least one filter 7 and the at least one cover 8 can be stand-alone elements or, if deemed expedient at the design and subsequent utilization stages, can be obtained integral in one piece and therefore form one single unit, in order to avoid any contamination of the filter by the user's hands during replacement .
  • the lateral openings 4 on the bands 21 can have many different geometric shapes and dimensions, designed to favour the ergonomics of the protective equipment 1.
  • the adjustment system or device 5 located in the rear part of the carcass 2 of the equipment 1 can have a non-exclusive shape and locking mechanism, therefore it can have fastening buttons, buckles, self-locking devices, slots or other solutions that can be used for the purpose.
  • An important characteristic of the invention lies in the at least one interchangeable filter 7, designed to be replaced when saturated, by simply releasing the at least one perforated cover 8 from the seat or housing 6.
  • the anterior part 20 of the structure or carcass 2 is provided internally, all around the perforated zone 30 and at a pre-set distance from the same, with an elastically deformable annular projection 31 (figure 3) defining the seat 6 and provided peripherally on the outside with a radial groove 32 snap-coupled to a peripherally internal annular projection 33 of a protruding peripheral radial edge 34 of the cover 8, which is therefore cup-shaped, so as to contain inside the at least one filter 7.
  • the at least one replaceable filter 7 is composed of/consists in a sheet membrane, for example rectangular or circular shaped and with extension such as to extend peripherally well beyond the perforated zone 30 and all around it, for example as far as the radially internal surface of the elastically deformable annular projection 31, on which the protruding edge 34 of the cover 8 is snap-coupled, radially on the outside.
  • the at least one replaceable filter 7, namely the sheet membrane of which it consists, is made of a filtering material with purely mechanical action composed of interlaced and randomly overlapped polymer filaments with nodule and fibril structure, as illustrated in the SEM microphotograph of figure 13.
  • Said interlaced and randomly overlapped polymer filaments with nodule and fibril structure are configured to create in the filter 7 a very twisty section for passage of the air formed of a non-linear succession of empty spaces in a quantity such as to ensure an overall porosity of the filter 7 ranging from 70% to 85% and retain particles up to 0.01 micron, and therefore also viruses.
  • the filter 7 is a membrane made of two-way expanded polytetrafluoroethylene (e-PTFE) sheet.
  • the e-PTFE sheet membrane 7 can be laminated on a support, for example on the cover 8, and has a thickness ranging from 0.1 to 20 micron.
  • the at least one filter 7 can also consist of a multilayer assembly of non-woven fibres and fabrics, for example made of PE or PP also and not only with specialized characteristics and in any case with breathable, anallergic and antibacterial properties in addition to providing non-exclusive filtering in the order of magnitude of a few microns, thus blocking undesired elements such as, according to the field of use and application: dust, viruses, solvents etc.
  • a filter 7 composed of the overlapping of various filtering sheets or membranes made of different materials, for example an e-PTFE membrane laminated on a non-woven sheet.
  • the at least one filter 7 is preferably designed to avoid the use of an outlet valve operated by the pressure difference between the inside and the outside of the protective equipment 1 and generated by the exhalation of the individual wearing the equipment 1.
  • FIGS 11 and 12 where details similar or equal to those already described are indicated for the sake of simplicity by the same reference numbers, illustrate a variation 100 of the protective equipment according to the invention.
  • the equipment 100 differs from the equipment 1 only due to the type of size adjustment system or device 5 used to lock the opposite rear ends 200 of the carcass or structure 2 to each other and, above all, due to the coupling system between perforated zone 30 and cover 8 with the relative at least one filter 7.
  • the anterior portion or part 20 of the structure or carcass 2 is provided internally, all around the perforated zone 30, with an elastically deformable annular projection 31 provided radially on the inside with an annular groove 32.
  • the filter pad 7 is housed inside the cover 8, within a seat 41 peripherally delimited on the outside by a radially protruding annular edge or projection 40 of the cover 8 configured to snap- couple inside the groove 32. In this way it is possible for a user to replace the filter 7 without ever coming into direct contact with it, resulting in considerable advantages in terms of hygiene.
  • the equipment 1,100 according to the invention occupies an innovative position in terms of use between FFP2 equipment and FFP3 equipment.
  • the production process of the equipment 1 is designed to obtain said equipment by injection moulding, the mould being purposely manufactured to specifications deemed ideal in the state of the art.
  • the carcass or structure 2 of the equipment 1, 100 made in a non-exclusive manner in one single part will furthermore be made of plastic material having the consistency of silicone and featuring antibacterial properties.
  • the perforated cover 8 can be made in a non-exclusive manner with the same technologies and the same or other synthetic materials .
  • the synthetic material used to make both the structure or carcass 2, preferably in one single piece, the cover 8 and even the filter 7 can also be transparent or translucent, coloured or colourless, thus allowing wider use of the equipment of the invention, meeting the needs of a greater number of users; more specifically, and non-exclusively, deaf-mute individuals will be able to easily lip-read the persons talking to them, eliminating the visual barrier usually represented by ordinary face masks.
  • the material purposely selected for the filter 7, namely the e-PTFE, at the thickness indicated previously is semi-transparent and in any case has a transparency sufficient to allow the mouth of the user wearing the protective equipment 1,100 to be seen from the outside.
  • the protective equipment according to the invention can be used by doctors and healthcare professionals during the treatment of patients so as to facilitate empathetic facial expressions, one of the most spontaneous methods of communication; it can also be used during recognition of the individual wearing it, for example at airports, check-ins, police checks etc. .
  • the protective equipment described can also be made largely of a mono-material, for example for the structure or carcass 2 and, once the mould for producing it has been made, it will be easy and inexpensive to reproduce while at the same time being efficient and safe.
  • the invention can be re-used with long life cycles, since in order to ensure maximum efficiency, the at least one filter 7 is simply replaced with a new one. Furthermore, the protective equipment according to the invention can be easily washed in order to guarantee maximum hygiene of the surfaces thereof.
  • the carcass 2 of the equipment 1, the at least one filter 7 and the at least one cover 8 can furthermore be produced in different dimensions, with at least three sizes: small (children), medium and large.
  • the entire equipment 1, 100 if made of the materials indicated above or in any case of polymers designed to be chemically inert and resistant to temperatures up to at least 120°C, can be easily sterilized, by steam, in an autoclave, by boiling or with chemical disinfectants.
  • the structure of the carcass 2 due to its design, is also characterized by being very lightweight, an element that will make the equipment more comfortable to wear; a further strength of the equipment is its line which, although non-exclusive, is attractive in purely aesthetic terms, thus limiting or eliminating any embarrassment when wearing PPE.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Zoology (AREA)
  • Pulmonology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

La présente invention concerne un équipement de protection personnel (PPE) (1) pour la protection des voies respiratoires, comprenant un support ou une carcasse (2) ayant une partie antérieure (20) pourvue de trous d'entrée et de sortie d'air (3), un filtre remplaçable (7) et un couvercle (8) pour retenir le filtre (7) dans un siège ou un logement prévu à cet effet (6) obtenu à l'intérieur sur la partie antérieure (20) du support (2) au niveau des trous d'entrée d'air (3) ; des bandes opposées (21) s'étendant en porte-à-faux à partir de la partie antérieure (20) et présentant des ouvertures (4) pour loger les oreilles d'un utilisateur (4) et, dans la partie arrière (200), un système de réglage (5) pour adapter l'équipement (1) à des utilisateurs de différents âges, hauteurs ou avec différentes formes de visage ; le filtre (7) consistant en un matériau filtrant ayant une action purement mécanique, composé de filaments de polymère à chevauchement aléatoire entrelacés avec une structure de nodule et de fibrilles ; la carcasse (2), le filtre (7) et le couvercle (8) étant réalisés par moulage de polymères de manière à être transparents ou translucides.
PCT/IB2020/054096 2020-04-06 2020-04-30 Demi-masque réutilisable transparent coloré pour usage médical et personnel WO2021205217A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102020000007231 2020-04-06
IT202000007231 2020-04-06

Publications (1)

Publication Number Publication Date
WO2021205217A1 true WO2021205217A1 (fr) 2021-10-14

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ID=71170690

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Application Number Title Priority Date Filing Date
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549543A (en) * 1982-12-01 1985-10-29 Moon William F Air filtering face mask
US20040078869A1 (en) * 2002-10-25 2004-04-29 Bell Daryl Steven Face mask having hook and loop type fastener
US7032751B2 (en) * 2002-12-19 2006-04-25 Kimberly-Clark Worldwide, Inc. Dispensing assembly for single piece face mask
US20080223370A1 (en) * 2007-03-13 2008-09-18 Jong-Hwa Kim Dustproof mask

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549543A (en) * 1982-12-01 1985-10-29 Moon William F Air filtering face mask
US20040078869A1 (en) * 2002-10-25 2004-04-29 Bell Daryl Steven Face mask having hook and loop type fastener
US7032751B2 (en) * 2002-12-19 2006-04-25 Kimberly-Clark Worldwide, Inc. Dispensing assembly for single piece face mask
US20080223370A1 (en) * 2007-03-13 2008-09-18 Jong-Hwa Kim Dustproof mask

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