US3539397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cell with temperature control
Assignee: RTX Corp
•
Filing: 1967-05-23
•
Granted: 1970-11-10
•
Expires: 1987-05-23
Abstract
No abstract record available.
Inventors
- 👤 Stephen J Keating Jr
- 👤 Richard D Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:22
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/04; H01M8/04007; H01M8/04029; H01M8/02; H01M8/0202; H01M8/0267; H01M8/04223; H01M8/04225; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2980749A
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US3141796A
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US3146131A
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US3239383A
Cited
US3352716A
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US3300341A
Cited
US3150657A
Cited
US3379572A
Cited
US3411951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |