US4493879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cell
Assignee: Hitachi Ltd
•
Filing: 1982-03-11
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Granted: 1985-01-15
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Expires: 2002-03-11
Abstract
Abstract A fuel cell comprising a pair of gas diffusion electrodes, an electrolyte retaining matrix disposed between said gas diffusion electrodes, and a phosphoric acid electrolyte disposed within said matrix, characterized by using as matrix that comprising one or more metal oxides having electronic insulation and insolubility in phosphoric acid and a binder is excellent in phosphoric acid retaining ability and can be used for a long period of time without degradation of the performance of fuel cell.
Inventors
- 👤 Toshiki Kahara
- 👤 Shimpei Matsuda
- 👤 Kenzo Ishii
- 👤 Seizi Takeuchi
- 👤 Jinichi Imahashi
- 👤 Akio Honji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:32
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/02; H01M8/0289; H01M8/0293; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M50/00; H01M50/40; H01M50/409; H01M50/44; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
74 words
In a fuel cell comprising a pair of gas diffusion electrodes and a matrix retaining phosphoric acid electrolyte, disposed between said gas diffusion electrodes, the improvement wherein said matrix comprises one or more metal oxides being electron-insulative and insoluble in phosphoric acid for enlarging the retention of phosphoric acid within said matrix and one or more polymeric binders, wherein the one metal oxide is a complex oxide containing zirconium and selenium, phosphorus, or silicon.
Claim 2
Dependent Claim
74 words
In a fuel cell comprising a pair of gas diffusion electrodes and a matrix retaining phosphoric acid electrolyte, disposed between said gas diffusion electrodes, the improvement wherein said matrix comprises one or more metal oxides being electron-insulative and insoluble in phosphoric acid for enlarging the retention of phosphoric acid within said matrix and one or more polymeric binders, wherein the one metal oxide is a complex oxide containing zirconium and selenium, phosphorus, or silicon.
Claim 3
Dependent Claim
29 words
A fuel cell according to claim 1, wherein the matrix consists essentially of one or more of the metal oxides and a fluoropolymer or phenolic resin as the binder.
Claim 4
Dependent Claim
37 words
A fuel cell according to claim 2, wherein the matrix consists essentially of 95 to 98% by weight of the one or more metal oxides and 2 to 5% by weight of the one or more binders.
Claim 5
Dependent Claim
28 words
A fuel cell according to claim 1, wherein the one or more metal oxides are contained in the matrix in an amount of 85% by weight or more.
Claim 6
Dependent Claim
24 words
A fuel cell according to claim 1 wherein the binder is contained in the matrix in an amount of 15% by weight or less.
Claim 7
Dependent Claim
13 words
A fuel cell according to claim 1 wherein the one binder is polytetrafluoroethylene.
Claim 8
Dependent Claim
36 words
In a fuel cell comprising a pair of gas diffusion electrodes and a matrix retaining phosphoric acid electrolyte, disposed between said gas diffusion electrodes, the improvement wherein said matrix comprises zircon and one or more binders.
Claim 9
Dependent Claim
36 words
In a fuel cell comprising a pair of gas diffusion electrodes and a matrix retaining phosphoric acid electrolyte, disposed between said gas diffusion electrodes, the improvement wherein said matrix comprises zircon and one or more binders.
Claim 10
Dependent Claim
47 words
In a fuel cell comprising a pair of gas diffusion electrodes and a matrix retaining phosphoric acid electrolyte disposed between said gas diffusion electrodes, the improvement wherein said matrix consists essentially of 95 to 98% by weight of zircon and 2 to 5% by weight of polytetrafluoroethylene.
Claim 11
Dependent Claim
47 words
In a fuel cell comprising a pair of gas diffusion electrodes and a matrix retaining phosphoric acid electrolyte disposed between said gas diffusion electrodes, the improvement wherein said matrix consists essentially of 95 to 98% by weight of zircon and 2 to 5% by weight of polytetrafluoroethylene.
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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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |