US3418169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct feed fuel cell with porous hydrophobic diffuser
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1965-10-04
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Granted: 1968-12-24
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Expires: 1985-10-04
Abstract
No abstract record available.
Inventors
- 👤 John M Matsen
- 👤 Duane G Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:20
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/08; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/61
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3311504A
Cited
US3181973A
Cited
US3297484A
Cited
US3244564A
Cited
US3287172A
Cited
US3281274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |