Patent US3421994A successfully refreshed from Google Patents.
US3421994A
Expired / Lapsed
US
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Electrochemical apparatus
Assignee: Pullman Inc
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Filing: 1966-09-27
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Granted: 1969-01-14
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Expires: 1986-09-27
Abstract
No abstract record available.
Inventors
- 👤 Joseph Adrien M Leduc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:49
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/70; C25B11/00; C25B11/02; C25B11/033; C25B9/30; C25B9/305; H; H01; H01M; H01M8/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1000608A
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US1486803A
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FR682574A
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US1970975A
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US1934945A
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US2669542A
Cited
US2723230A
Cited
US2952604A
Cited
US2841547A
Cited
US3065163A
Cited
US3161546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |