US4643182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable protective mask
Assignee: CRANE FREDERICK G JR
•
Filing: 1983-04-20
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Granted: 1987-02-17
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Expires: 2003-04-20
Abstract
Abstract A protective mask formed from a porous non-woven sheet material which is made of glass fibers and a suitable binding agent, and which may optionally include a gas adsorbent substance. The mask protects the respiratory system of the wearer from the effects of toxic gases and the like.
Inventors
- 👤 Max Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:46
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2055; B01D39/2058; B01D39/2062; A; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1184; A62; A62B; A62B17/00; A62B17/04; A62B18/00; A62B18/02; B01D39/16; B01D39/2003; B01D39/2017; B01D39/2024; B01D2239/00; B01D2239/04; B01D2239/0407; B01D2239/06; B01D2239/0604; B01D2239/0618; B01D2239/08; B01D2239/086; B01D2239/12; B01D2239/1225; B01D2239/1233; B01D2239/125; Y; Y10; Y10S; Y10S55/00; Y10S55/35; Y10T; Y10T442/00; Y10T442/60; Y10T442/699
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
112 words
A protective mask comprising a non-woven, air-permeable sheet material consisting essentially of glass fibers, a binding agent and polymer micro-bits derived from an expanded, non-brittle thermoplastic polymer selected from the group of a styrene polymer, a polyolefin having from 2 to 6 carbon atoms, or co-polymers or blends thereof, or micro-bits of a flexible foamed polyurethane, said polymer micro-bits being substantially completely free of intact cells of the expanded polymer from which they are produced; said sheet material being adapted to sealingly engage the wearer and envelop at least a portion of the face of the wearer, including the nose and mouth; and means for securing the mask in place during use.
Claim 2
Dependent Claim
112 words
A protective mask comprising a non-woven, air-permeable sheet material consisting essentially of glass fibers, a binding agent and polymer micro-bits derived from an expanded, non-brittle thermoplastic polymer selected from the group of a styrene polymer, a polyolefin having from 2 to 6 carbon atoms, or co-polymers or blends thereof, or micro-bits of a flexible foamed polyurethane, said polymer micro-bits being substantially completely free of intact cells of the expanded polymer from which they are produced; said sheet material being adapted to sealingly engage the wearer and envelop at least a portion of the face of the wearer, including the nose and mouth; and means for securing the mask in place during use.
Claim 3
Dependent Claim
15 words
The protective mask of claim 1, wherein the binding agent is an organic chemical binder.
Claim 4
Dependent Claim
75 words
The protective mask of claim 1, wherein the binding agent is a cobeat of cellulose fibers and polymer micro-bits being derived from an expanded, non-brittle thermoplastic polymer selected from the group of a styrene polymer, a polyolefin having from 2 to 6 carbon atoms, or copolymers or blends thereof, or micro-bits of a flexible foamed polyurethane, said polymer micro-bits being substantially completely free of intact cells of the expanded polymer from which they are produced.
Claim 5
Dependent Claim
31 words
The protective mask of claim 3, in which said cobeat of polymer micro-bits and cellulose fibers comprises one part of polymer micro-bits and from one to two parts of cellulose fibers.
Claim 6
Dependent Claim
12 words
The protective mask of claim 3, which includes an organic chemical binder.
Claim 7
Dependent Claim
15 words
The protective mask of claim 5, which includes fibrous additive for imparting tear strength thereto.
Claim 8
Dependent Claim
14 words
The protective mask of claim 6, wherein said fibrous additive comprises polyester terephthalate fiber.
Claim 9
Dependent Claim
20 words
The protective mask of claim 3, in which said sheet material includes a fibrous additive for imparting tear strength thereto.
Claim 10
Dependent Claim
14 words
The protective mask of claim 8, wherein said fibrous additive comprises polyester terephthalate fiber.
Claim 11
Dependent Claim
79 words
The protective mask of claim 8, which includes polymer micro-bits derived from an expanded, non-brittle thermoplastic polymer selected from the group of a styrene polymer, a polyolefin having from 2 to 6 carbon atoms, or copolymers or blends thereof, or micro-bits of a flexible foamed polyurethane, said polymer micro-bits being substantially completely free of intact cells of the expanded polymer from which they are produced, the amount of said polymer micro-bits being in addition to those comprising the cobeat.
Claim 12
Dependent Claim
15 words
The protective mask of claim 10, wherein said sheet material includes an organic chemical binder.
Claim 13
Dependent Claim
20 words
The protective mask of claim 11, including a gas adsorbent substance distributed throughout the enveloping portion of said sheet material.
Claim 14
Dependent Claim
17 words
The protective mask of claim 11, in which said sheet material includes a wet strength enhancing agent.
Claim 15
Dependent Claim
16 words
The protective mask of claim 13, wherein said wet strength enhancing agent is a melamine-formadehyde resin.
Claim 16
Dependent Claim
20 words
The protective mask of claim 13, including a gas adsorbent substance distributed throughout the enveloping portion of said sheet material.
Claim 17
Dependent Claim
29 words
The protective mask of claim 1, wherein said glass fibers measure between about 0.1 inches and 0.25 inches in length and about 0.5 microns and 4 microns in diameter.
Claim 18
Dependent Claim
41 words
The protective mask of claim 1, wherein said mask is smaller than the head of the wearer and is provided with sealing means to engage the skin of the wearer along the periphery of the enveloping portion of said sheet material.
Claim 19
Dependent Claim
35 words
The protective mask of claim 17, in which the sheet material envelops the entire head of the wearer and is provided with means for drawing said sheet material snugly around the neck of the wearer.
Claim 20
Dependent Claim
51 words
The protective mask of claim 18, in which the enveloping portion of said mask, other than the window, comprises sheet material consisting essentially of glass fibers, styrene-polymer micro-bits, at least a portion of said polymer micro-bits being intimately blended with cellulose fibers to form a cobeat, and an organic chemical binder.
Claim 21
Dependent Claim
19 words
The protective mask of claim 19, wherein said sheet material includes a fibrous additive for imparting tear strength thereto.
Claim 22
Dependent Claim
14 words
The protective mask of claim 20, wherein said fibrous additive comprises polyester terephthalate fibers.
Claim 23
Dependent Claim
33 words
The protective mask of claim 20, in which the enveloping portion of said mask includes a gas adsorbent substance selected from finely divided activated carbon particles, crystalline molecular sieve particles or zeolite particles.
Claim 24
Dependent Claim
19 words
The protective mask of claim 22, in which the enveloping portion of said mask includes anion exchange resin particles.
Claim 25
Dependent Claim
26 words
The protective mask of claim 20, wherein said styrene polymer micro-bits are of polystyrene, said binder is polyvinyl alcohol and said fibrous additive is polyethylene terephthalate.
Claim 26
Dependent Claim
20 words
The protective mask of claim 24, in which the enveloping portion of said mask includes finely divided activated carbon particles.
Claim 27
Dependent Claim
42 words
The protective mask of claim 1, wherein the sheet material envelops a major portion of the face of the wearer, including the eyes, said sheet material having an opening to permit wearer vision and including a transparent window sealed within said opening.
Claim 28
Dependent Claim
22 words
The protective mask of claim 25, including an adsorbent-free, porous material applied to the side of the sheet material facing the wearer.
Claim 29
Dependent Claim
67 words
The protective mask of claim 1, wherein said sheet material comprises a plurality of plies, at least one ply having an average pore size effective for removing from the inhaled air particulate matter having a particle size of 0.3 microns or greater, and at least one other ply containing a gas adsorbent substance, in an amount sufficient for removing from the inhaled air toxic gases or vapors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |