Patent US2900289A successfully refreshed from Google Patents.
US2900289A
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Transition fuel cells
Assignee: Individual
•
Filing: 1957-01-30
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Granted: 1959-08-18
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Expires: 1977-01-30
Abstract
No abstract record available.
Inventors
- 👤 Kenneth G Harlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:29
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/02; H01M8/0271; B; B32; B32B; B32B27/00; B64; B64D; B64D37/00; B64D37/02; B64D37/06; B29; B29K; B29K2021/00; B32B2319/00; B32B2457/00; B32B2457/18; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02T; Y02T50/00; Y02T50/40; Y10; Y10S; Y10S220/00; Y10S220/90; Y10S428/00; Y10S428/912; Y10T; Y10T428/00; Y10T428/19; Y10T428/192; Y10T428/195; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24107; Y10T428/24479; Y10T428/24521; Y10T428/24612; Y10T428/24777; Y10T428/24793
Claims Analysis
Total Claims: 0
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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) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |