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Patent US3525643A successfully refreshed from Google Patents.
US3525643A
Expired / Lapsed
US
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Process for producing electrical energy in a fuel cell
Assignee: VARTA AG
•
Filing: 1966-04-13
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Granted: 1970-08-25
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Expires: 1986-04-13
Abstract
No abstract record available.
Inventors
- 👤 Dieter Spahrbier
- 👤 Guenther Ryhiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:45
CPC Classifications
H; H01; H01M; H01M8/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3135673A
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US3222267A
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GB1011076A
Cited
US3178315A
Cited
US3294588A
Cited
US3188241A
Cited
US3338747A
Cited
US3375139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |