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US4637383A Expired / Lapsed US ⏱️ 0.0 years remaining

Toxic environmental breathing hood

Assignee: Lockheed Martin Corp
•
Filing: 1985-12-23
•
Granted: 1987-01-20
•
Expires: 2005-12-23
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Abstract

Abstract The invention is a breathing hood assembly for protecting a person from a fire and toxic gases produced therefrom. The invention comprises a fire resistant hood of a sufficient size so as to fit over the person's head. The hood has a neck portion including a drawstring or elastic for sealing the hood to the neck of the person. The interior surface of the neck portion is lined with a silica gel and barium oxide impregnated cloth. A transparent window is mounted to the hood extending about the periphery thereof. A filter is mounted to the hood which extends about the periphery thereof and is in communication with the interior of the hood. The filter includes an inner sodium bisulfate impregnated cloth layer and an outer fire resistant cloth cover. The outer fire resistant cloth cover is joined at its edges to the edges of the inner cloth layer forming a donut shaped cavity. A donut shaped cloth bag impregnated with silica gel and barium hydroxide is mounted within the cavity. The cavity is filled with a flexible polyurethane foam. The polyurethane foam is impregnated with activated charcoal, micro pumice stone particles coated with caustic soda and a compound of manganese dioxide and copper oxide.

Inventors

  • 👤 Edward L. Lopez

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 05:44
CPC Classifications
A; A62; A62B; A62B17/00; A62B17/04; Y; Y10; Y10S; Y10S2/00; Y10S2/905; Y10S2/906

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 205 words
A breathing hood assembly for protecting a person from a fire and toxic gases produced, therefrom comprising: a hood of fire resistant, gas impervious material sufficiently sized so as to fit over the person's head, said hood having a neck portion including means for sealing the hood to the neck of the person, the interior surface of said neck portion lined with a silica gel and barium oxide impregnated cloth; a transparent window mounted to said hood extending about the periphery thereof; and, a filter mounted to said hood extending about the periphery thereof, said filter in communication with the interior of said hood, said filter comprising: an inner sodium bisulfate impregnated cloth layer secured at its edges to and annular opening extending around the periphery of said hood; an outer fire resistant cloth cover joined at its edges to the edges of said inner cloth layer, said inner and outer cloth layers forming a donut shaped cavity; a donut shaped cloth bag impregnated with silica gel and barium hydroxide lining said cavity and, a flexible polyurethane foam filling said cavity, said polyurethane foam impregnated with activated charcoal, micro pumice stone particles coated with caustic soda, and a compound of manganese dioxide and copper oxide.
Claim 2
Dependent Claim 205 words
A breathing hood assembly for protecting a person from a fire and toxic gases produced, therefrom comprising: a hood of fire resistant, gas impervious material sufficiently sized so as to fit over the person's head, said hood having a neck portion including means for sealing the hood to the neck of the person, the interior surface of said neck portion lined with a silica gel and barium oxide impregnated cloth; a transparent window mounted to said hood extending about the periphery thereof; and, a filter mounted to said hood extending about the periphery thereof, said filter in communication with the interior of said hood, said filter comprising: an inner sodium bisulfate impregnated cloth layer secured at its edges to and annular opening extending around the periphery of said hood; an outer fire resistant cloth cover joined at its edges to the edges of said inner cloth layer, said inner and outer cloth layers forming a donut shaped cavity; a donut shaped cloth bag impregnated with silica gel and barium hydroxide lining said cavity and, a flexible polyurethane foam filling said cavity, said polyurethane foam impregnated with activated charcoal, micro pumice stone particles coated with caustic soda, and a compound of manganese dioxide and copper oxide.
Claim 3
Dependent Claim 21 words
The hood assembly of claim 1 wherein compound of manganese dioxide and copper oxide are in a 60% to 40% ratio.
Claim 4
Dependent Claim 18 words
The hood assembly of claim 2 wherein the interior of said window is coated with an anti-fog coating.

References Cited (Backward Citations)

FR857420A Cited
US2810386A Cited
US2850011A Cited
US4046939A Cited
JPS5367291A Cited
US4231118A Cited
US4297117A Cited
US4583535A Cited
US4382440A Cited
US4523588A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-01-19 1990-07-21 1991-01-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-01-19 1994-07-21 1995-01-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-01-19 1998-07-21 1999-01-20 $7700.00 Window Closed / Lapsed

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