Patent US4935642A successfully refreshed from Google Patents.
Patent US4870959A successfully refreshed from Google Patents.
US4870959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective breathing mask
Assignee: Duram Rubber Products
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Filing: 1988-02-05
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Granted: 1989-10-03
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Expires: 2008-02-05
Abstract
Abstract A protective breathing mask comprising fire-resistant stretchable material shaped as a hood for wearing over and enclosing the head. An access opening allows the head to be placed therethrough such that a substantially airtight closure is provided at the neck. In one embodiment, portions of the mask are removed at eye and mouth locations whereat they are replaced by respective viewing and filter materials sealed to the stretchable material. The viewing material comprises transparent fire-resistant material, and the filter material comprises a plurality of fire-resistant flexible layers at least one of which has embedded therein activated charcoal particles.
Inventors
- 👤 Ron Reisman
- 👤 Uri Amit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:53
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02; A62B17/00; A62B17/04; Y; Y10; Y10S; Y10S2/00; Y10S2/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A protective breathing mask comprising: fire-resistant stretchable material of not less than about 300% stretchability shaped as a hood and having an access opening through which the head is placed for wearing the mask over the head and enclosing it such that a substantially airtight closure is provided at the neck, said stretchability inherently providing, without ancillary tightening means, a minimum unoccupied interior volume of said hood such that, upon donning, the inrush of surrounding air is minimized, at least a portion of the mask providing a transparent viewing area for the eyes, a mouth location of such stretchable material being replaced by filter materials sealed thereto and comprising a plurality of fire-resistant flexible layers at least one of which has imbedded therein activated charcoal particles.
Claim 2
Dependent Claim
126 words
A protective breathing mask comprising: fire-resistant stretchable material of not less than about 300% stretchability shaped as a hood and having an access opening through which the head is placed for wearing the mask over the head and enclosing it such that a substantially airtight closure is provided at the neck, said stretchability inherently providing, without ancillary tightening means, a minimum unoccupied interior volume of said hood such that, upon donning, the inrush of surrounding air is minimized, at least a portion of the mask providing a transparent viewing area for the eyes, a mouth location of such stretchable material being replaced by filter materials sealed thereto and comprising a plurality of fire-resistant flexible layers at least one of which has imbedded therein activated charcoal particles.
Claim 3
Dependent Claim
46 words
The mask of claim 1 wherein said stretchable material is a thin sheet shaped as a hood having front and rear panels sealed by contact glue at a seam on side and top edges, said access opening being formed in a bottom edge which is folded.
Claim 4
Dependent Claim
12 words
The mask of claim 2 wherein said stretchable material is neoprene rubber.
Claim 5
Dependent Claim
11 words
The mask of claim 2 wherein said stretchable material is silicone.
Claim 6
Dependent Claim
17 words
The mask of claim 5 wherein said transparent viewing area is provided by said silicone stretchable material.
Claim 7
Dependent Claim
24 words
The mask of claim 1 wherein said stretchable material is a thin sheet shaped as a hood which is formed as a seamless enclosure.
Claim 8
Dependent Claim
33 words
The mask of claim 1 wherein said filter materials comprise five layers of material including three cloth layers each having activated charcoal particles embedded therein, a foam layer, and a particle filter layer.
Claim 9
Dependent Claim
28 words
The mask of claim 7 wherein said filter materials are laminated by intermediate glue layers in the region about their edges, leaving space between adjacent filter material layers.
Claim 10
Dependent Claim
17 words
The mask of claim 7 wherein said filter material is disposed on either side of the nose.
Claim 11
Dependent Claim
18 words
The mask of claim 7 wherein said activated charcoal cloth layers are treated with gas absorbing metallic elements.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |