Patent US3575827A successfully refreshed from Google Patents.
US3575827A
Expired / Lapsed
US
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System for reduction of aluminum
Assignee: Individual
•
Filing: 1967-12-06
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Granted: 1971-04-20
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Expires: 1987-12-06
Abstract
Abstract A SYSTEM FOR ELECTROLYTIC REDUCTION OF ALUMINUM, THE SYSTEM INCLUDING A PLURALITY OF ADJACENT CELLS FOR EFFECTING THE ELECTROLYTIC REDUCTION OF ALUMINUM IN WHICH THE CELLS ARE CONNECTED IN LINE AND EACH CELL INCLUDES A CATHODE AND A PLURALITY OF ANODES WITH CATHODE OF ONE CELL ELECTRICALLY CONNECTED TO EACH ANODE OF THE NEXT ADJACENT CELL FOR DIRECTING THE ENTIRE CURRENT FROM THE CATHODE OF THE ONE CELL TO EACH ANODE OF THE ADJACENT CELL.
Inventors
- 👤 Arthur F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:06
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/16
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |