Patent US4633231A successfully refreshed from Google Patents.
Patent US3418168A successfully refreshed from Google Patents.
US3418168A
Expired / Lapsed
US
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Fuel cell with water removing means at cathode
Assignee: WR Grace and Co
•
Filing: 1964-12-07
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Granted: 1968-12-24
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Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Wentworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:52
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/10; H01M8/1007; H01M50/00; H01M50/40; H01M50/409; H01M50/489; H01M50/491; H01M8/04; H01M8/04291; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US2653987A
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US2772322A
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US3134696A
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US3092518A
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US3216882A
Cited
US3297484A
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US3172784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |