US3582483A
Expired / Lapsed
US
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Process for electrolytically producing aluminum
Assignee: Elektrokemisk AS
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Filing: 1967-09-18
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Granted: 1971-06-01
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Expires: 1987-09-18
Abstract
Abstract AN ELECTRIC FURNACE FOR PRODUCTION OF ALUMINUM BY MELT ELECTROLYSIS IS PROVIDED WITH AN OVERHEAD ANNULAR SODERBERG ANODE HAVING A HOLLOW CENTER COEXTENSIVE WITH THE LONGITUDINAL ANODE AXIS. THE FURNACE IS OPERATED UNDER A LOAD ABOVE 100,000 AMPERES AND UP TO ABOUT 500,00 AMPERES, SAID HIGH LOAD BEING MADE POSSIBLE BY THE ANNULAR CONFIGURATION OF THE ANODE.
Inventors
- 👤 Mathias Ovrom Sem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:13
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/12; C25C3/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |