US3533918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making electrodes for fuel cells
Assignee: Individual
•
Filing: 1967-04-18
•
Granted: 1970-10-13
•
Expires: 1987-04-18
Abstract
No abstract record available.
Inventors
- 👤 John C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:45
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8817; C; C25; C25D; C25D5/00; C25D5/54; D; D06; D06M; D06M11/00; D06M11/83; H01M4/8825; H01M4/8853; H01M8/00; H01M8/02; H01M8/0202; H01M8/023; H01M8/0241; H01M8/0245; H01M4/8647; H01M4/8657; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190100430A
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GB196063A
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US2474502A
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US2454610A
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US2965551A
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US3179575A
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US3228797A
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US3235473A
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US3122449A
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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) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |