US2974032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of alumina
Assignee: Pechiney SA
•
Filing: 1960-02-24
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Granted: 1961-03-07
•
Expires: 1980-02-24
Abstract
No abstract record available.
Inventors
- 👤 Grunert Erhard
- 👤 Mercier Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:10
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
THE PROCESS OF REDUCING ALUMINA COMPRISING THE STEP OF SUBJECTING A CHARGE OF ALUMINA AND CARBON TO THE ACTION OF AN ELECTRIC ARC AND HEATING THE CHARGE TO A TEMPERATURE ABOVE 2300* C. AND THEREBY FORMING AND MAINTAINING A MOLTEN MIXTURE OF ALUMINUM AND ALUMINUM CARBIDE CONTAINING LESS THAN ABOUT 3 PERCENT BY WEIGHT ALUMINUM OXIDE.
Claim 2
Dependent Claim
56 words
THE PROCESS OF REDUCING ALUMINA COMPRISING THE STEP OF SUBJECTING A CHARGE OF ALUMINA AND CARBON TO THE ACTION OF AN ELECTRIC ARC AND HEATING THE CHARGE TO A TEMPERATURE ABOVE 2300* C. AND THEREBY FORMING AND MAINTAINING A MOLTEN MIXTURE OF ALUMINUM AND ALUMINUM CARBIDE CONTAINING LESS THAN ABOUT 3 PERCENT BY WEIGHT ALUMINUM OXIDE.
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |