US3425875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing fuel cell electrode containing fluorocarbon polymer and carbon black-supported platinum group metal
Assignee: Engelhard Industries Inc
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Filing: 1966-09-15
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Granted: 1969-02-04
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Expires: 1986-09-15
Abstract
No abstract record available.
Inventors
- 👤 Otto J Adlhart
- 👤 Carl D Keith
- 👤 George R Pond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:49
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |