US3764509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic furnaces for the production of aluminium
Assignee: Rio Tinto Switzerland AG
•
Filing: 1972-02-03
•
Granted: 1973-10-09
•
Expires: 1992-02-03
Abstract
Abstract A set of blocks of carbon and/or graphite intended for assembly to form the cathode of a cell for the production of aluminum by fusion electrolysis, these blocks possessing four lateral surfaces, at least a pair of which opposed to each other being inclined at different angles to the vertical in order to obtain a mutual wedging of the blocks against upwards acting forces, particularly within a row of blocks arranged along a conductor bar. An electrolytic cell with a cathode made of such blocks.
Inventors
- 👤 K Etzel
- 👤 P Aeschbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:58
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; 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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |