US3850694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure nickel hydrogen cell
Assignee: International Telecommunications Satellite Organization
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Filing: 1972-11-27
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Granted: 1974-11-26
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Expires: 1992-11-27
Abstract
Abstract A new sealed rechargeable electric fuel cell of the type using a reoxidizable nickel hydroxide as the positive electrode reactant and hydrogen as the negative electrode reactant. The cell uses a hexagonal nickel - rare earth metal hydride compound for storage of hydrogen gas which causes the cell to be maintained at a low gas pressure during charging and discharging.
Inventors
- 👤 J Dunlop
- 👤 M Earl
- 👤 Ommering G Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:06
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/04; H01M10/00; H01M10/34; H01M10/345; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
AN IMPROVED RECHARGEABLE POWER CELL OF THE TYPE THAT COMPRISES A HERMETICALLY SEALED CONTAINER, SAID CONTAINER INCLUDING THEREIN POSITIVE ELECTRODE MEANS COMPRISING NIOOH IN THE CHARGED STATE AND NI (OH)2 IN THE DISCHARGED STATE, NEGATIVE ELECTRODE MEANS COMPRISING A CATALYST MOUNTED ON A CONDUCTIVE SUPPORT, SAID CATALYST BEING A MATERIAL CAPABLE OF DISSOCIATING MOLECULAR HYDROGEN TO MONATOMIC HYDROGEN, AN ALKALINE ELECTROLYTE, ELECTROLYTE RETAINING MEANS DISPOSED BETWEEN SAID POSITIVE ELECTRODE MEANS AND SAID NEGATIVE ELECTRODE MEANS AND A SUPPLY OF HYDROGEN WHEREIN THE IMPROVEMENT COMPRISESA HEXAGONAL RARE-EARTH INTERMETALLIC HYDRIDE DISPOSED WITHIN SAID CONTAINER OUT OF CONTACT WITH SAID ELECTOLYTE, SAID INTERMETALLIC HYDRIDE BEING A MATERIAL CAPABLE OF ABSORBING AND DESORBING HYDROGEN IN RESPONSE TO CHANGES IN PRESSURE.
Claim 2
Dependent Claim
116 words
AN IMPROVED RECHARGEABLE POWER CELL OF THE TYPE THAT COMPRISES A HERMETICALLY SEALED CONTAINER, SAID CONTAINER INCLUDING THEREIN POSITIVE ELECTRODE MEANS COMPRISING NIOOH IN THE CHARGED STATE AND NI (OH)2 IN THE DISCHARGED STATE, NEGATIVE ELECTRODE MEANS COMPRISING A CATALYST MOUNTED ON A CONDUCTIVE SUPPORT, SAID CATALYST BEING A MATERIAL CAPABLE OF DISSOCIATING MOLECULAR HYDROGEN TO MONATOMIC HYDROGEN, AN ALKALINE ELECTROLYTE, ELECTROLYTE RETAINING MEANS DISPOSED BETWEEN SAID POSITIVE ELECTRODE MEANS AND SAID NEGATIVE ELECTRODE MEANS AND A SUPPLY OF HYDROGEN WHEREIN THE IMPROVEMENT COMPRISESA HEXAGONAL RARE-EARTH INTERMETALLIC HYDRIDE DISPOSED WITHIN SAID CONTAINER OUT OF CONTACT WITH SAID ELECTOLYTE, SAID INTERMETALLIC HYDRIDE BEING A MATERIAL CAPABLE OF ABSORBING AND DESORBING HYDROGEN IN RESPONSE TO CHANGES IN PRESSURE.
Claim 3
Dependent Claim
25 words
A cell as claimed in claim 1 further including support means lining the inner walls of said container and having said intermetallic hydride embedded therein.
Claim 4
Dependent Claim
26 words
A cell as claimed in claim 2 further including means for coating said support means and said intermetallic hydride to form a hydrogen permeable hydrophobic surface.
Claim 5
Dependent Claim
15 words
A cell as claimed in claim 3 wherein said support means comprises a nickel screen.
Claim 6
Dependent Claim
38 words
A cell as claimed in claim 1 wherein said intermetallic hydride comprises a composition of the formula AB5 where A represents a rare earth metal and B represents a compound selected from the group of nickel and cobalt.
Claim 7
Dependent Claim
13 words
A cell as claimed in claim 5 wherein said intermetallic hydride comprises LaNi5.
Claim 8
Dependent Claim
13 words
A cell as claimed in claim 5 wherein said intermetallic hydride comprises Ce0.3La0.7Ni5.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |