US3440103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel cell and cathode including platinum alloy with cobalt or niobium
Assignee: Engelhard Industries Inc
•
Filing: 1964-07-13
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Granted: 1969-04-22
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Expires: 1984-07-13
Abstract
No abstract record available.
Inventors
- 👤 Johann G E Cohn
- 👤 Otto J Adlhart
- 👤 Keith O Hever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:08
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; H01M4/928; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M2300/0008; H01M2300/0011; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2018760A
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US2384501A
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US3306780A
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US3276909A
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US3203834A
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US3206337A
Cited
US3262816A
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US3235473A
Cited
US3274031A
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US3291753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |