Patent US3497433A successfully refreshed from Google Patents.
US3497433A
Expired / Lapsed
US
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Bipolar electrolytic cell and process of operating said cell
Assignee: Electric Reduction Company of Canada Ltd
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Filing: 1967-06-01
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Granted: 1970-02-24
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Expires: 1987-06-01
Abstract
No abstract record available.
Inventors
- 👤 John W S Weed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:07
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/02; C25B11/036; C25B1/00; C25B1/01; C25B1/24; C25B1/26; C25B1/265; C25B9/00; C25B9/70; C25B9/73; C25B9/75
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) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |