Patent US4139765A successfully refreshed from Google Patents.
US3434945A
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Terminal voltage regulation in electrolytic aluminum production
Assignee: Rio Tinto Switzerland AG
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Filing: 1964-08-27
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Granted: 1969-03-25
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Expires: 1984-08-27
Abstract
No abstract record available.
Inventors
- 👤 Johannes Schmitt
- 👤 Hans Schaper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:03
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1396919A
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US2560854A
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US2545412A
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US2545411A
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US2731412A
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US2545413A
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US2606869A
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US2933440A
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US2939824A
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US3329592A
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US3317413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |