USH1316H - Disposable gas and toxic fume mask - Google Patents
Disposable gas and toxic fume mask Download PDFInfo
- Publication number
- USH1316H USH1316H US08/011,638 US1163893A USH1316H US H1316 H USH1316 H US H1316H US 1163893 A US1163893 A US 1163893A US H1316 H USH1316 H US H1316H
- Authority
- US
- United States
- Prior art keywords
- hood
- mask
- subject
- covering
- air
- 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
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Images
Classifications
-
- 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
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B17/00—Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes
- A62B17/04—Hoods
Definitions
- Suitable materials for hood portion 13 may therefore include single or multiple transparent layers of plastic or other useful commercially available synthetic material such as TEFZELTM, TEFLONTM, SURLYNTM, nylon, nylon/SURLYNTM laminate, TEFLONTM/KAPTONTM trilaminate, and MYLARTM, all of which exhibit chemical resistance of more than two hours (a desirable minimum) and, for some, more than 24 hours.
- Mask 10 may additionally be made substantially flame resistant utilizing materials such as the KAPTONTM, TEFLONTM/KAPTONTM/TEFLONTM trilaminate, or TEFLONTM materials.
- Tube 30 of the demonstration unit comprised medical grade silicone rubber because of its characteristically good shelf life and ability both to endure temperature extremes without substantial degradation of performance and to retain a desired shape after folding.
- Connecting tube 30 terminates at its second outlet end 31 with T-shaped member 32 having inlet 33, outlet 34 and defining mouthpiece 35 means at the three respective ends thereof.
- a standard respiratory care type member 32 (Baxter #001500, AIRLIFETM, American Pharmaseal Co., American Hospital Supply Corp., Valencia CA) and mouthpiece 35 were used.
- Tests were run in demonstration of the invention utilizing the demonstration unit described above.
- a test chamber was charged with a concentration of 25 mg/m 3 of corn oil in the form of a polydispersed aerosol having a mass mean aerodynamic diameter of 0.5-0.6 micron, by atomizing liquid corn oil at room temperature using a Laskin nozzle.
- the aerosol concentration was maintained by diluting the concentrated aerosol with room air.
- Three subjects wearing the demonstration mask performed certain exercises within the test chamber, including normal breathing, deep breathing, head side-to-side, head up and down, run in place and touch ceiling and floor. Each exercise was performed for one minute with a total wear time of ten minutes for each subject.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Zoology (AREA)
- Pulmonology (AREA)
- Toxicology (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
A disposable respiratory protective gas and toxic fume mask is described which comprises a transparent hood of thin film chemical resistant material sealable at the neck or to the face of a subject and covering the eyes, nose and mouth, a filter in the hood for filtering and conducting air into the hood, a tube interconnecting the filter and a mouthpiece and including a first one-way valve for conducting filtered air to the subject, a second one-way valve in the mouthpiece for conducting exhaled air air into the interior of the hood and thereby generating an overpressure condition within the hood.
Description
The invention described herein may be manufactured and used by or for the Government of the United States for all governmental purposes without the payment of any royalty.
The present invention relates generally to devices for respiratory protection in contaminated environments, and more particularly to a protective mask having a transparent hood with filter 10 and one-way valving structure which provides a positive pressure inside the mask and prevents the ingestion of contaminants.
Prior art protective masks generally require external air sources for delivering air under pressure into the masks. In the valving structure of the invention, the user ingests air through a filter and first one-way valve and exhales through a second one-way valve which maintains positive pressure inside the mask. Excess pressure escapes around the peripheral seal or through a low resistance one-way valve. The valving arrangement of the invention minimizes the dead space volume of air which may be rebreathed with negative physiological impact.
It is therefore a principal object of the invention to provide a chemical and toxic fume mask for personal respiratory protection against noxious and contaminated environments.
It is another object of the invention to provide a protective respiratory mask effective against substantially all known nerve and blister agents.
It is a further object of the invention to provide an inexpensive, disposable respiratory protection mask.
It is another object of the invention to provide a respiratory protective mask sized for substantially universal personnel fit.
It is another object of the invention to provide a respiratory Protective mask having substantial (high) protection factor.
It is yet another object of the invention to provide a respiratory protective mask which is easily and quickly donned.
It is another object of the invention to provide a respiratory protective mask having a long shelf storage life and which is sufficiently compact and portable to be carried on the person.
These and other objects of the invention will become apparent as a detailed description of representative embodiments proceeds.
In accordance with the foregoing principles and objects of the invention, a disposable respiratory protective gas and toxic fume mask is described which comprises a transparent hood of thin film chemical resistant material sealable at the neck or to the face of a subject and covering the eyes, nose and mouth, a filter in the hood for filtering and conducting air into the hood, a tube interconnecting the filter and a mouthpiece and including a first one-way valve for conducting filtered air to the subject, a second one-way valve in the mouthpiece for conducting exhaled air air into the interior of the hood and thereby generating an overpressure condition within the hood.
The invention will be more clearly understood from the following detailed description of representative embodiments thereof read in conjunction with the accompanying drawings wherein:
FIG. 1 is a perspective view of a representative embodiment of the invention as worn by a subject;
FIG. 2 is an enlarged view of the filter, connecting tube and mouthpiece assembly of the FIG. 1 embodiment; and
FIG. 3 is a perspective view of a second embodiment of the invention as worn by a subject.
Referring now to the drawings, FIG. 1 is a perspective view a representative embodiment of a disposable respiratory protection mask 10 according to the invention as worn by subject 11. In accordance with a governing principle of the invention, the protective mask of the invention includes a transparent, thin film, chemically resistant covering over and peripherally sealed around the eyes, nose and mouth of subject 11. Accordingly, in the FIG. 1 embodiment, mask 10 may comprise transparent hood portion 13 (or including a transparent region shown by dotted line) having a closed end 14 and an open end 15 and which is sized to receive and envelop head and neck of subject 11. Hood portion 13 may terminate at open end 15 in skirt portion 16 of any suitable width for covering a selected part of the lower neck and shoulder region of subject 11. Hood portion 13 may comprise any suitable transparent thin film material as would occur to a skilled artisan guided by these teachings, preferably with suitable anti-fog coatings, and having a desirable degree of resistance to attack by airborne chemicals which may be encountered in toxic environments (such as nerve gas, mustard gas, blood agents, blister agents, hydrogen chloride gas, chlorine gas, cyanic acid, acrolein, ammonia and benzene). Film thickness for hood portion 13 is not considered limiting of the invention, and may be of the order of a few (2-3) mils. Mask 10 may generally be stored or used at temperatures from about -20° F. to 125° F. Suitable materials for hood portion 13 may therefore include single or multiple transparent layers of plastic or other useful commercially available synthetic material such as TEFZEL™, TEFLON™, SURLYN™, nylon, nylon/SURLYN™ laminate, TEFLON™/KAPTON™ trilaminate, and MYLAR™, all of which exhibit chemical resistance of more than two hours (a desirable minimum) and, for some, more than 24 hours. Mask 10 may additionally be made substantially flame resistant utilizing materials such as the KAPTON™, TEFLON™/KAPTON™/TEFLON™ trilaminate, or TEFLON™ materials. In a mask 10 built in demonstration of the invention, hood portion 13 comprised transparent nylon (2 mil) because this material is inexpensive, has high light transmission and minimal haze, and heat seals at relatively low temperature. A standard antifog solution was applied to the frontal vision area of the demonstration mask 10.
Referring additionally to FIG. 2, shown therein is an enlarged view of the filter, connecting tube and mouthpiece assembly of mask 10 of FIG. 1. In order to accommodate attachment of filter 23, opening 24 is provided in hood portion 13 to receive outlet 25 of filter 23. Filter 23 may be selected to target one or more noxious airborne substances or toxic environments such as those suggested above, to provide a desired degree of effective respiratory protection for time periods in the range of from about 15 minutes to 10 hours, limited only by filter 23 effectiveness. In the demonstration unit, filter 23 comprised a standard military M-13A2 filter (NSN 4240001655026) of known effectiveness for removing chemical and biological agents, including nerve, blood and blister types, and particulate matter. Convenient size, flexibility and almost flat aspect ratio of this filter rendered it a good choice for the demonstration unit as it, in combination with hood portion 13 could be folded for insertion into a pocket of a garment (e.g. flight suit) worn by subject 11. Outlet 25 of filter 23 has a protruding flanged ring 27 for providing an airtight seal against hood portion 23 at opening 24 and sealably receiving a first inlet end 29 of flexible connecting tube 30 sized in diameter and length for passing filtered air from filter 23 to subject 11. Material selection for connecting tube 30 is not critical because in using mask 10, tube 30 is not exposed to the ambient toxic environment. Tube 30 of the demonstration unit comprised medical grade silicone rubber because of its characteristically good shelf life and ability both to endure temperature extremes without substantial degradation of performance and to retain a desired shape after folding. Connecting tube 30 terminates at its second outlet end 31 with T-shaped member 32 having inlet 33, outlet 34 and defining mouthpiece 35 means at the three respective ends thereof. In the demonstration unit, a standard respiratory care type member 32 (Baxter #001500, AIRLIFE™, American Pharmaseal Co., American Hospital Supply Corp., Valencia CA) and mouthpiece 35 were used. One- way flow valves 37,38 were disposed in member 32 at respective inlet 33 and outlet 34 ends thereof, for allowing air flow only in the direction indicated by the arrows, viz, inwardly toward subject 11 at inlet 33 and outwardly away from subject 11 at outlet 34. The small volumetric size of member 32 as compared to that of hood portion 13 minimizes dead space into which subject 11 breathes in the use of mask 10 and ensures that subject 11 breathes only filtered air and exhales carbon dioxide and water vapor rich but contaminate free air into hood portion 13 and maintains therein a positive pressure over the ambient atmosphere.
In order to provide additional protection against smoke and fumes from a burning source, a carbon monoxide catalyst/honeycomb 40 or similar means may be included in connecting tube 30, as suggested in FIG. 2, or other convenient location in the inspiratory circuit. Additionally, an optional water vapor absorbent filter may be connected to member 32 such as at 41 in FIG. 2 in order to add water vapor to inhaled air and extract it from exhaled air. The water vapor filter may also be included in the exhale only portion of the circuit. An optional one-way valve 43 of preselected low resistance may be inserted in the wall of hood portion 13 as suggested in FIG. 1 in order to assist or replace the neck seal for maintaining desired preselected pressurization within hood portion 13 during use of mask 10. Further, a silica gel packet 45 or other suitable moisture absorbent means may be disposed at any convenient location within hood portion 13 for reducing the relative humidity of exhaled air within mask 10.
Tests were run in demonstration of the invention utilizing the demonstration unit described above. A test chamber was charged with a concentration of 25 mg/m3 of corn oil in the form of a polydispersed aerosol having a mass mean aerodynamic diameter of 0.5-0.6 micron, by atomizing liquid corn oil at room temperature using a Laskin nozzle. The aerosol concentration was maintained by diluting the concentrated aerosol with room air. Three subjects wearing the demonstration mask performed certain exercises within the test chamber, including normal breathing, deep breathing, head side-to-side, head up and down, run in place and touch ceiling and floor. Each exercise was performed for one minute with a total wear time of ten minutes for each subject. Leakage of aerosol into the mask was measured by continuously sampling at a rate of one liter/min through a length of tubing interconnecting hood portion 13 and a five-decade forward-light scattering photometer. A protection factor (ratio of test chamber aerosol concentration to hood concentration) was determined for each exercise along with a mean overall protection factor for all the tests. The tests indicated that an overall protection factor of at least 1000:1 is characteristic of the invention as exemplified by the demonstration unit. Depending on the ability of the subject to function during the tests, a large protection factor of the order of 20,000:1 was achieved over the full range of activity under the tests. Speech intelligibility of a subject while wearing the demonstration unit approached 100% at up to 10 feet; use of a telephone by the subject was not substantially impaired by the mask.
Referring now to FIG. 3, shown therein is a perspective view of mask 50 representing another embodiment of the invention as worn by subject 51. Mask 50 of FIG. 3 may substantially resemble a conventional gas mask including a flexible protective body portion 53 covering the eyes, nose and mouth of subject 51, and having a transparent window portion 54 and elastic straps 55 in order to provide a substantially airtight peripheral seal 57. Materials of construction may be selected according to the teachings above related to mask 10 of FIG. 1. A filter 59 substantially the same as filter 23 of the FIG. 1 embodiment is operatively attached to body portion 53 in manner substantially as described above for filter 23 and hood portion 13. A connecting tube, T shaped member, mouthpiece and filters (not shown in FIG. 3) in substantially the configuration shown in FIG. 2 is included inside body portion 53 and operatively connected to filter 59. One-way valve 61 of preselected low resistance may be disposed in the wall of body portion 53 for maintaining desired preselected pressurization within mask 50.
The invention therefore provides an improved respiratory protection mask. It is understood that modifications to the invention may be made as might occur to one with skill in the field of the invention within the scope of the appended claims. All embodiments contemplated hereunder which achieve the objects of the invention have therefore not been shown in complete detail. Other embodiments may be developed without departing from the spirit of the invention or from the scope of the appended claims.
Claims (13)
1. A respiratory protective mask, comprising:
(a) a transparent covering for the eyes, nose and mouth of a subject, said covering having a peripheral seal for preventing air leakage around said covering into the region defined between said covering and said subject;
(b) filter means attached to said covering for filtering and conducting air through said covering;
(c) a tube operatively connected at a first inlet end thereof to said filter means and including means defining a mouthpiece at a second outlet end thereof for conducting filtered air to said mouth of said subject;
(d) first one-way valve means disposed within said tube for conducting said filtered air only toward said mouthpiece defining means; and
(e) second one-way valve means included in said mouthpiece defining means for conducting air only from said mouth of said subject and into said region whereby air exhaled by said subject generates an overpressure condition within said region.
2. The mask of claim 1 wherein said covering comprises a hood sized for enveloping the head of said subject with said peripheral seal at the neck of said subject.
3. The mask of claim 1 wherein said covering comprises a chemically resistant thin film material.
4. The mask of claim 1 further comprising a third one-way valve in said covering for selectively limiting the overpressure within said region.
5. The mask of claim 1 further comprising a carbon monoxide oxidation catalyst disposed within said tube.
6. The mask of claim 1 further comprising a water vapor absorbent material disposed on said covering within said region.
7. The mask of claim 1 further comprising an anti-fogging coating on said covering.
8. A respiratory protective mask, comprising:
(a) a hood having an opening for receiving and enveloping the head and neck of a subject, said hood including a transparent portion alignable with the eyes of said subject;
(b) an adjustable elastic band on said hood at said opening for resiliently sealing said hood at the neck of said subject for preventing air leakage into the interior of said hood;
(c) filter means attached to said hood for filtering and conducting air through said hood;
(d) a tube operatively connected at a first inlet end thereof to said filter means and including means defining a mouthpiece at a second outlet end thereof for conducting filtered air to said mouth of said subject;
(e) first one-way valve means disposed within said tube for conducting said filtered air only toward said mouthpiece defining means; and
(f) second one-way valve means included in said mouthpiece defining means for conducting air only from said mouth of said subject and into said hood whereby air exhaled by said subject generates an overpressure condition within said hood.
9. The mask of claim 8 wherein said hood comprises a chemically resistant thin film material.
10. The mask of claim 8 further comprising a third one-way valve in said hood for selectively limiting the overpressure within said hood.
11. The mask of claim 8 further comprising a carbon monoxide oxidation catalyst disposed within said tube.
12. The mask of claim 8 further comprising a water vapor absorbent material disposed within said hood.
13. The mask of claim 8 further comprising an anti-fogging coating on said hood.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/011,638 USH1316H (en) | 1993-02-01 | 1993-02-01 | Disposable gas and toxic fume mask |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/011,638 USH1316H (en) | 1993-02-01 | 1993-02-01 | Disposable gas and toxic fume mask |
Publications (1)
Publication Number | Publication Date |
---|---|
USH1316H true USH1316H (en) | 1994-06-07 |
Family
ID=21751330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/011,638 Abandoned USH1316H (en) | 1993-02-01 | 1993-02-01 | Disposable gas and toxic fume mask |
Country Status (1)
Country | Link |
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US (1) | USH1316H (en) |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5431156A (en) * | 1992-01-31 | 1995-07-11 | Sundstrom Safety Ab | Combined half-mask and hood type protective respiratory device |
US6460538B1 (en) * | 1997-09-15 | 2002-10-08 | Protector Technologies B.V. | Emergency escape breathing apparatus |
US6543450B1 (en) * | 1998-09-29 | 2003-04-08 | John T. Flynn | Survival mask |
US20030136411A1 (en) * | 2001-07-03 | 2003-07-24 | Ming-Mei Hsieh | Portable life mask |
US20030192103A1 (en) * | 2002-04-12 | 2003-10-16 | Avery Martin J. | Personal protective suit with partial flow restriction |
US6763835B1 (en) * | 2001-10-01 | 2004-07-20 | The United States Of America As Represented By The Secretary Of The Army | Chemical/biological special operations mask |
US6796304B2 (en) | 2002-04-12 | 2004-09-28 | 3M Innovative Properties Company | Personal containment system with sealed passthrough |
US20040216736A1 (en) * | 2003-03-28 | 2004-11-04 | Lee Peter D | Rigid air ducting for respirator hoods and helmets |
US20050011517A1 (en) * | 2003-07-17 | 2005-01-20 | Steinert Robert Brace | Protective suit ventilated by self-powered bellows |
US20050010996A1 (en) * | 2003-07-17 | 2005-01-20 | Steinert Robert B. | Protective suit ventilated by self-powered bellows |
US20050061317A1 (en) * | 2003-09-18 | 2005-03-24 | King John H. | Inflatable respirator hood |
US6892725B2 (en) * | 2002-04-26 | 2005-05-17 | Mine Safety Appliances Company | Protective hoods and neck seals for use therein |
US20050193472A1 (en) * | 2004-03-02 | 2005-09-08 | Courtney Mark J. | Chemical and biological protective hood assembly |
US20050241642A1 (en) * | 2003-11-12 | 2005-11-03 | Krzysztofik J M | Breathing respirator |
US7007690B1 (en) * | 2000-08-31 | 2006-03-07 | The United States Of America As Represented By The Secretary Of The Army | Advanced chemical/biological crew mask |
US7028688B1 (en) * | 2005-04-05 | 2006-04-18 | The United States Of America As Represented By The Secretary Of The Army | Operationally adaptable chemical-biological mask |
US20060118116A1 (en) * | 2002-10-02 | 2006-06-08 | Michael Porat | Emergency escape mask |
US20100037891A1 (en) * | 2007-03-23 | 2010-02-18 | Walker Garry J | Air delivery apparatus for respirator hood |
US20100224194A1 (en) * | 2007-10-05 | 2010-09-09 | Walker Garry J | Respirator Flow Control Apparatus and Method |
US8166972B2 (en) | 2008-11-14 | 2012-05-01 | Shahriar Daliri | Antiseptic mask and method of using antiseptic mask |
US20140345627A1 (en) * | 2013-05-24 | 2014-11-27 | John N. Younts | Helmet moisture control system |
WO2016075451A1 (en) * | 2014-11-10 | 2016-05-19 | C-Tex Limited | Personal protection device |
US10137320B2 (en) | 2007-03-23 | 2018-11-27 | 3M Innovative Properties Company | Respirator flow control apparatus and method |
WO2019141890A1 (en) * | 2018-01-17 | 2019-07-25 | Luis Maria Aizpurua Plaza | Device for renewing air and preventing fogging inside full-face helmets and similar |
US10391337B2 (en) | 2007-11-12 | 2019-08-27 | 3M Innovative Properties Company | Respirator assembly with air flow direction control |
CN110874684A (en) * | 2018-09-03 | 2020-03-10 | 中国石油化工股份有限公司 | Method for evaluating effectiveness of individual benzene protection toxin filter box |
US20210331002A1 (en) * | 2020-04-22 | 2021-10-28 | Nicholas J. Singer | Head encapsulation unit |
US11766080B2 (en) | 2020-06-26 | 2023-09-26 | Mark Lamoncha | Face shield for attachment to goggles or eyeglasses |
US11865261B2 (en) | 2020-07-14 | 2024-01-09 | Mark Lamoncha | Respirator mask |
-
1993
- 1993-02-01 US US08/011,638 patent/USH1316H/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
Avon Industrial Polymers Limited, NBCS10, New General Service Respirator, 4 sheets. |
Cited By (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5431156A (en) * | 1992-01-31 | 1995-07-11 | Sundstrom Safety Ab | Combined half-mask and hood type protective respiratory device |
US6460538B1 (en) * | 1997-09-15 | 2002-10-08 | Protector Technologies B.V. | Emergency escape breathing apparatus |
US6543450B1 (en) * | 1998-09-29 | 2003-04-08 | John T. Flynn | Survival mask |
US7007690B1 (en) * | 2000-08-31 | 2006-03-07 | The United States Of America As Represented By The Secretary Of The Army | Advanced chemical/biological crew mask |
US20030136411A1 (en) * | 2001-07-03 | 2003-07-24 | Ming-Mei Hsieh | Portable life mask |
US6763835B1 (en) * | 2001-10-01 | 2004-07-20 | The United States Of America As Represented By The Secretary Of The Army | Chemical/biological special operations mask |
US6796304B2 (en) | 2002-04-12 | 2004-09-28 | 3M Innovative Properties Company | Personal containment system with sealed passthrough |
US20030192103A1 (en) * | 2002-04-12 | 2003-10-16 | Avery Martin J. | Personal protective suit with partial flow restriction |
US6948191B2 (en) | 2002-04-12 | 2005-09-27 | 3M Innovative Properties Company | Personal protective suit with partial flow restriction |
US6892725B2 (en) * | 2002-04-26 | 2005-05-17 | Mine Safety Appliances Company | Protective hoods and neck seals for use therein |
US20060118116A1 (en) * | 2002-10-02 | 2006-06-08 | Michael Porat | Emergency escape mask |
US20040216736A1 (en) * | 2003-03-28 | 2004-11-04 | Lee Peter D | Rigid air ducting for respirator hoods and helmets |
US7104264B2 (en) | 2003-03-28 | 2006-09-12 | 3M Innovative Properties Company | Rigid air ducting for respirator hoods and helmets |
US20050011517A1 (en) * | 2003-07-17 | 2005-01-20 | Steinert Robert Brace | Protective suit ventilated by self-powered bellows |
US20050010996A1 (en) * | 2003-07-17 | 2005-01-20 | Steinert Robert B. | Protective suit ventilated by self-powered bellows |
US7156093B2 (en) | 2003-09-18 | 2007-01-02 | E. D. Bullard Company | Inflatable respirator hood |
US20050061317A1 (en) * | 2003-09-18 | 2005-03-24 | King John H. | Inflatable respirator hood |
US20050241642A1 (en) * | 2003-11-12 | 2005-11-03 | Krzysztofik J M | Breathing respirator |
US7523750B2 (en) | 2003-11-12 | 2009-04-28 | Krzysztofik J Mario | Breathing respirator |
WO2006019413A1 (en) * | 2004-03-02 | 2006-02-23 | Gore Enterprise Holdings, Inc. | Chemical and biological protective hood assembly |
US20050193472A1 (en) * | 2004-03-02 | 2005-09-08 | Courtney Mark J. | Chemical and biological protective hood assembly |
US7028688B1 (en) * | 2005-04-05 | 2006-04-18 | The United States Of America As Represented By The Secretary Of The Army | Operationally adaptable chemical-biological mask |
US20100037891A1 (en) * | 2007-03-23 | 2010-02-18 | Walker Garry J | Air delivery apparatus for respirator hood |
US8936022B2 (en) | 2007-03-23 | 2015-01-20 | 3M Innovative Properties Company | Air delivery apparatus for respirator hood |
US11130008B2 (en) | 2007-03-23 | 2021-09-28 | 3M Innovative Properties Company | Respirator flow control apparatus and method |
US10137320B2 (en) | 2007-03-23 | 2018-11-27 | 3M Innovative Properties Company | Respirator flow control apparatus and method |
US20100224194A1 (en) * | 2007-10-05 | 2010-09-09 | Walker Garry J | Respirator Flow Control Apparatus and Method |
US9868001B2 (en) | 2007-10-05 | 2018-01-16 | 3M Innovative Properties Company | Respirator flow control apparatus and method |
US10391337B2 (en) | 2007-11-12 | 2019-08-27 | 3M Innovative Properties Company | Respirator assembly with air flow direction control |
US8166972B2 (en) | 2008-11-14 | 2012-05-01 | Shahriar Daliri | Antiseptic mask and method of using antiseptic mask |
US20140345627A1 (en) * | 2013-05-24 | 2014-11-27 | John N. Younts | Helmet moisture control system |
GB2547865A (en) * | 2014-11-10 | 2017-08-30 | Carbon Tex Ltd | Personal protection device |
GB2547865B (en) * | 2014-11-10 | 2021-02-17 | Carbon Tex Ltd | Personal protection device |
WO2016075451A1 (en) * | 2014-11-10 | 2016-05-19 | C-Tex Limited | Personal protection device |
US11253734B2 (en) | 2014-11-10 | 2022-02-22 | Carbon Tex Limited | Personal protection device using monolithic activated carbons |
WO2019141890A1 (en) * | 2018-01-17 | 2019-07-25 | Luis Maria Aizpurua Plaza | Device for renewing air and preventing fogging inside full-face helmets and similar |
CN110874684A (en) * | 2018-09-03 | 2020-03-10 | 中国石油化工股份有限公司 | Method for evaluating effectiveness of individual benzene protection toxin filter box |
CN110874684B (en) * | 2018-09-03 | 2022-09-06 | 中国石油化工股份有限公司 | Method for evaluating effectiveness of individual benzene protection toxicity filtering box |
US20210331002A1 (en) * | 2020-04-22 | 2021-10-28 | Nicholas J. Singer | Head encapsulation unit |
US11612771B2 (en) * | 2020-04-22 | 2023-03-28 | Nicholas J. Singer | Head encapsulation unit |
US11738217B2 (en) * | 2020-04-22 | 2023-08-29 | Nicholas J. Singer | Head encapsulation unit |
US11766080B2 (en) | 2020-06-26 | 2023-09-26 | Mark Lamoncha | Face shield for attachment to goggles or eyeglasses |
US11865261B2 (en) | 2020-07-14 | 2024-01-09 | Mark Lamoncha | Respirator mask |
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