US3729398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and cell for the electrolytic recovery of aluminum
Assignee: Rio Tinto Switzerland AG
•
Filing: 1971-02-09
•
Granted: 1973-04-24
•
Expires: 1991-02-09
Abstract
Abstract PROCESS FOR THE ELECTROLYTIC RECOVERY OF ALUMINUM FROM A FUSED ALUMINA-CONTAINING BATH OF ALKALI ALUMINUM FLUORIDE IN WHICH THE FLUORIDE MELT IS KEPT IN DIRECT CONTACT WITH A MELT CONSISTING OF ELECTROLYTE HIGHLY CONCENTRATED IN ALUMINA AND SEPARATED FROM THE LIQUID CATHODIC ALUMINUM. THE ELECTROLYTIC CELL USED THEREFORE COMPRISES ONE OR MORE TROUGHS RESTING ON ITS BOTTOM AND PROVIDED FOR THE RECEPTION OF THE HIGHLY CONCENTRATED ELECTROLYTE.
Inventors
- 👤 Hatting W Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:24
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/20; C25C3/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |