US2915443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolyte for aluminum reduction
Assignee: Alcan Research and Development Ltd
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Filing: 1957-06-12
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Granted: 1959-12-01
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Expires: 1977-06-12
Abstract
No abstract record available.
Inventors
- 👤 William G Wallace
- 👤 Skantze Hugo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:04
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
THE METHOD OF PRODUCING METALLIC ALUMINUM FROM ALUMINA WHICH COMPRISES DISSOLVING ALUMINA IN A MOLTEN ELECTROLYTE CONSISTING ESSENTIALLY OF SODIUM CHLORIDE IN AMOUNT FROM ABOVE 4% TO LESS THAN 9% CALCIUM FLUORIDE IN AMOUNT FROM 6% TO 9%, AND THE BALANCE SODIUM AND ALUMINUM FLUORIDE MATERIAL, AND PASSING ELECTRIC CURRENT THROUGH SAID ELECTROLYTE.
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) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |