Patent US6418443B1 successfully refreshed from Google Patents.
US3470026A
Expired / Lapsed
US
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Method of operating fuel cell with carbon-containing fuel
Assignee: Prototech Inc
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Filing: 1965-03-03
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Granted: 1969-09-30
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Expires: 1985-03-03
Abstract
No abstract record available.
Inventors
- 👤 Walter Juda
- 👤 David Mcleod Moulton
- 👤 Robert L Novack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:07
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)
CA616031A
Cited
US736017A
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FR1166831A
Cited
US3092516A
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US3275476A
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US3152015A
Cited
US3220887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |