US2544231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing alumina from slags or sinters prepared from lime and alumina-bearing materials
Assignee: Alcan Research and Development Ltd
•
Filing: 1947-01-18
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Granted: 1951-03-06
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Expires: 1967-01-18
Abstract
No abstract record available.
Inventors
- 👤 Hollum Arne Murer
- 👤 James William Addison
- 👤 Semple William Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:36
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/16; C01F7/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE PROCESS OF PRODUCING ALUMINA FROM SLAGS SINTERS PREPARED FROM LIME AND ALUMINABEARING MATERIALS, WHICH COMPRISES LEACHING THE SLAG OF SINSTER AT A TEMPERATURE OF ABOUT 90* C. IN A SODIUM CARBONATE SOLUTION CONTAINING FREE NAOH AND HAVING AN ALKALI CONCENTRATION OF OVER 100 GRAMS PER LITRE.
Claim 2
Dependent Claim
47 words
THE PROCESS OF PRODUCING ALUMINA FROM SLAGS SINTERS PREPARED FROM LIME AND ALUMINABEARING MATERIALS, WHICH COMPRISES LEACHING THE SLAG OF SINSTER AT A TEMPERATURE OF ABOUT 90* C. IN A SODIUM CARBONATE SOLUTION CONTAINING FREE NAOH AND HAVING AN ALKALI CONCENTRATION OF OVER 100 GRAMS PER LITRE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |