Patent US4529671A successfully refreshed from Google Patents.
US4529671A
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Fuel cell
Assignee: Hitachi Ltd
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Filing: 1982-09-02
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Granted: 1985-07-16
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Expires: 2002-09-02
Abstract
Abstract In a fuel cell comprising an electrolyte-retaining matrix interposed between a pair of gas-diffusion electrodes, the matrix comprises particles or fibers of a substance unreactive with phosphoric acid and having electron-insulating properties and an inorganic binder.
Inventors
- 👤 Toshiki Kahara
- 👤 Shinpei Matsuda
- 👤 Kenzo Ishii
- 👤 Seizi Takeuchi
- 👤 Jinichi Imahashi
- 👤 Akio Honji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:53
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/02; H01M8/0289; H01M8/0293; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
A fuel cell comprising a pair of gas-diffusion electrodes and a phosphoric acid electrolyte-retaining matrix interposed between the electrodes, said matrix consisting of 30-90 wt. % of a substance unreactive with phosphoric acid and having electron-insulating properties and 10-70 wt. % of a metal phosphate binder.
Claim 2
Dependent Claim
46 words
A fuel cell comprising a pair of gas-diffusion electrodes and a phosphoric acid electrolyte-retaining matrix interposed between the electrodes, said matrix consisting of 30-90 wt. % of a substance unreactive with phosphoric acid and having electron-insulating properties and 10-70 wt. % of a metal phosphate binder.
Claim 3
Dependent Claim
14 words
A fuel cell according to claim 1 wherein the metal phosphate is zirconium phosphate.
Claim 4
Dependent Claim
32 words
A fuel cell according to claim 1 wherein the substance unreactive with phosphoric acid and having electron-insulating properties is in the form of particles having an average particle diameter of 0.1-10 μm.
Claim 5
Dependent Claim
32 words
A fuel cell according to claim 3, wherein the matrix is a porous structure of the particles of said substance unreactive with the phosphoric acid bonded together with the metal phosphate binder.
Claim 6
Dependent Claim
22 words
A fuel cell according to claim 1 wherein the substance unreactive with phosphoric acid and having electron-insulating properties is an inorganic substance.
Claim 7
Dependent Claim
14 words
A fuel cell according to claim 5 wherein the inorganic substance is a carbide.
Claim 8
Dependent Claim
13 words
A fuel cell according to claim 6 wherein the carbide is silicon carbide.
Claim 9
Dependent Claim
41 words
A phosphoric acid-type fuel cell comprising a pair of gas-diffusion electrodes and a phosphoric acid electrolyte-retaining matrix interposed between the electrodes, said matrix consisting of 30-90 wt. % of silicon carbide particles and 10-70 wt. % of a metal phosphate binder.
Claim 10
Dependent Claim
41 words
A phosphoric acid-type fuel cell comprising a pair of gas-diffusion electrodes and a phosphoric acid electrolyte-retaining matrix interposed between the electrodes, said matrix consisting of 30-90 wt. % of silicon carbide particles and 10-70 wt. % of a metal phosphate binder.
Claim 11
Dependent Claim
28 words
A phosphoric acid-type fuel cell according to claim 8, wherein said matrix is a porous structure of the silicon carbide particles bonded together with the metal phosphate binder.
Claim 12
Dependent Claim
23 words
A phosphoric acid-type fuel cell according to claim 9, wherein the particles of silicon carbide have an average particle diameter of 0.1-10 μm.
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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |