US3419900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cells with alkali metal hydroxide electrolyte and electrode containing fluorocarbon polymer
Assignee: Leesona Corp
•
Filing: 1966-12-22
•
Granted: 1968-12-31
•
Expires: 1986-12-22
Abstract
No abstract record available.
Inventors
- 👤 Glenn V Elmore
- 👤 Howard A Tanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:54
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/08; H01M8/14; H01M8/141; H01M8/142; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |