US3525643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing electrical energy in a fuel cell
Assignee: VARTA AG
•
Filing: 1966-04-13
•
Granted: 1970-08-25
•
Expires: 1986-04-13
Abstract
No abstract record available.
Inventors
- 👤 Dieter Spahrbier
- 👤 Guenther Ryhiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:01
CPC Classifications
H; H01; H01M; H01M8/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2969315A
Cited
US3098768A
Cited
US3227585A
Cited
US3234562A
Cited
US3135673A
Cited
US3222267A
Cited
GB1011076A
Cited
US3178315A
Cited
US3294588A
Cited
US3188241A
Cited
US3338747A
Cited
US3375139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |