US3493436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Utilizing magnetic flux in producing fuel cells
Assignee: Individual
•
Filing: 1964-07-16
•
Granted: 1970-02-03
•
Expires: 1984-07-16
Abstract
No abstract record available.
Inventors
- 👤 Carsten Ingeman Johnsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:58
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB190703834A
Cited
US1182513A
Cited
US1217738A
Cited
FR973217A
Cited
US3013098A
Cited
US3186929A
Cited
US3303055A
Cited
GB1025234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |