US3718550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the electrolytic production of aluminum
Assignee: Rio Tinto Switzerland AG
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Filing: 1970-12-02
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Granted: 1973-02-27
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Expires: 1990-12-02
Abstract
Abstract PROCESS FOR THE ELECTROLYTIC PRODUCTION OF ALUMINUM FROM A FUSED ALUMINA-CONTAINING BATH OF ALKALI ALUMINUM FLUORIDE IN WHICH THE PART OF THE ANODE IN CONTACT WITH THE BATH CONSISTS OF AN OXIDIC ELECTRON-CONDUCTING CERAMIC MATERIAL CHEMICALLY RESISTANT TO THE FLUORIDE BATH. PREFERABLY THE CERAMIC MATERIAL CONSISTS PREDOMINANTLY OF SNO2.
Inventors
- 👤 H Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:38
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/02; C25C7/025; C25C3/00; C25C3/06; C25C3/08; C25C3/12
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |