US3533852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cell matrix and method of impregnating periphery of matrix with chlorotrifluoro-ethylene polymer
Assignee: Consolidated Natural Gas Service Co Inc
•
Filing: 1966-12-28
•
Granted: 1970-10-13
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Expires: 1986-12-28
Abstract
No abstract record available.
Inventors
- 👤 Bernard S Baker
- 👤 Daniel Y C Ng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:34
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/02; H01M8/0271; H01M8/0273; H01M8/0289; H01M8/0293; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2729694A
Cited
US2890261A
Cited
GB953608A
Cited
US3311507A
Cited
US3342642A
Cited
US3379573A
Cited
US3306779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |