US3537904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for preventing internal currents in a fuel cell
Assignee: Monsanto Research Corp
•
Filing: 1967-12-04
•
Granted: 1970-11-03
•
Expires: 1987-12-04
Abstract
No abstract record available.
Inventors
- 👤 Seigo Matsuda
- 👤 Bernard P Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:26
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/04; H01M8/04276; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1807595A
Cited
GB189814726A
Cited
GB198274A
Cited
US1781005A
Cited
US2635431A
Cited
US3235407A
Cited
US3340095A
Cited
US3331704A
Cited
GB1085899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |