US3554812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cell comprising asbestos diaphragms and nickel mesh electrolyte supports
Assignee: Siemens AG
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Filing: 1969-02-14
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Granted: 1971-01-12
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Expires: 1989-02-14
Abstract
Abstract AN ABESTOS DIAPHRAGM IS POSITIONED BETWEEN AND NEXT ADJACENT THE SUPPORTING STRUCTURE AND EACH OF A PAIR OF SPACED THIN ELECTRODES IN AN ELECTROCHEMICAL CELL. THE SUPPORTING STRUCTURE IS POROUS AND IS IMPREGNATED WITH NICKEL MESH HAVING LARGE PORES AND REGIONS ADJACENT THE ELECTRODES OF NICKEL MESH HAVING FINE PORES.
Inventors
- 👤 Ferdinand V Sturm
- 👤 Herbert Nischik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:27
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/08; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |