Patent US4078893A successfully refreshed from Google Patents.
US4078893A
Expired / Lapsed
US
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Catalyst system for the detection and elimination of hydrogen gas
Assignee: United States Department of the Army
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Filing: 1976-06-30
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Granted: 1978-03-14
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Expires: 1996-06-30
Abstract
Abstract A catalyst system for the elimination of hydrogen gas which comprises a polytetrafluoroethylene-bonded catalyst layer of carbon mixed with platinum black, a porous polytetrafluoroethylene film on the side thereof which faces the gas flow, and a metal backplate, all integrally bonded together. The assembly is particularly useful for the elimination of hydrogen gas in sealed equipment housings, for example, those containing batteries. A similar system may also be used as a detector of hydrogen by utilizing a detector paper therewith which indicates the presence of water.
Inventors
- 👤 Sol Gilman
- 👤 Paul J. Bramhall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:20
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/52; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/70; B01J23/74; B01J23/755; C; C01; C01B; C01B3/00; C01B5/00; G; G01; G01N; G01N31/00; G01N31/22; G01N31/223; G01N31/224; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
A catalyst system for the detection and elimination of hydrogen gas in the presence of oxygen which comprises a catalyst layer of carbon powder mixed with a high surface area powder capable of catalyzing hydrogen oxidation in a fluorocarbon polymer binder, wherein said high surface area powder is selected from the group consisting of platinum black, palladium black, rhodium black, iridium black, and nickel powder, a first porous hydrophobic polymer film disposed on one side of said catalyst layer, a second thin spacer film disposed on the other side of said catalyst layer, and a detector paper which detects the presence of water, said detector paper being in contact with said spacer film.
Claim 2
Dependent Claim
113 words
A catalyst system for the detection and elimination of hydrogen gas in the presence of oxygen which comprises a catalyst layer of carbon powder mixed with a high surface area powder capable of catalyzing hydrogen oxidation in a fluorocarbon polymer binder, wherein said high surface area powder is selected from the group consisting of platinum black, palladium black, rhodium black, iridium black, and nickel powder, a first porous hydrophobic polymer film disposed on one side of said catalyst layer, a second thin spacer film disposed on the other side of said catalyst layer, and a detector paper which detects the presence of water, said detector paper being in contact with said spacer film.
Claim 3
Dependent Claim
17 words
A catalyst system according to claim 1, wherein said porous hydrophobic polymer film is a fluorocarbon polymer.
Claim 4
Dependent Claim
15 words
A catalyst system according to claim 1, wherein said spacer film is a fluorocarbon polymer.
Claim 5
Dependent Claim
76 words
A catalyst system for the detection and elimination of hydrogen gas in the presence of oxygen which comprises a polytetrafluoroethylene-bonded catalyst layer of carbon powder mixed with platinum black, a first porous polytetrafluoroethylene film disposed on one side of said catalyst layer, a second thin spacer film disposed on the other side of said catalyst layer, and a detector paper which detects the presence of water, said detector paper being in contact with said spacer film.
Claim 6
Dependent Claim
76 words
A catalyst system for the detection and elimination of hydrogen gas in the presence of oxygen which comprises a polytetrafluoroethylene-bonded catalyst layer of carbon powder mixed with platinum black, a first porous polytetrafluoroethylene film disposed on one side of said catalyst layer, a second thin spacer film disposed on the other side of said catalyst layer, and a detector paper which detects the presence of water, said detector paper being in contact with said spacer film.
Claim 7
Dependent Claim
17 words
A catalyst system according to claim 4, wherein said detector paper is saturated with CoCl 2 .
Claim 8
Dependent Claim
22 words
A catalyst system according to claim 4, which is disposed in a metal holder having a viewing window for said detector paper.
Claim 9
Dependent Claim
14 words
A catalyst system according to claim 4, wherein said thin spacer film is polytetrafluoroethylene.
Claim 10
Dependent Claim
22 words
A catalyst system according to claim 4, wherein said catalyst layer comprises a carbon powder-platinum black-polytetrafluoroethylene mixture supported on a metal screen.
Claim 11
Dependent Claim
14 words
A catalyst system according to claim 8, wherein said carbon powder is carbon black.
Claim 12
Dependent Claim
15 words
A catalyst system according to claim 8, wherein said metal screen is a nickel screen.
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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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |