US2701752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of alumina
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1951-12-19
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Granted: 1955-02-08
•
Expires: 1971-12-19
Abstract
No abstract record available.
Inventors
- 👤 John L Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:08
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
AN IMPROVED WET CAUSTIC ALUMINATE PROCESS FOR THE PRODUCTION OF ALUMINA FROM ORES CONTAINING CAUSTIC SOLUBLE MONOHYDRATE AND TRIHYDRATE ALUMINA COMPRISING THE STEPS OF SUBJECTING A CHARGE OF A MONOHYDRATE ALUMINA-CONTAINING ORE TO AN INITIAL DIGESTION IN CAUSTIC ALUMINATE LIQUOR HAVING A CAUSTIC SODA CONCENTRATION AND TEMPERATURE WHICH PROVIDE A MONOHYDRATE EXTRACTION POTENTIAL IN THE LIQUOR THROUGHOUT SAID DIGESTION THEREBY SUBSTANTIALLY COMPLETELY EXTRACTING THE ALUMINA OF THE ORE CHARGE, AND THEREAFTER SUBSTANTIALLY INCREASING THE DISSOLVED ALUMINA CONTENT OF THE LIQUOR BY DIGESTING THEREIN A CHARGE OF AN ORE, THE SOLUBLE ALUMINA CONTENT OF WHICH IS AT LEAST PREDOMINANTLY TRIHYDRATE, UNDER CONDITIONS OF CAUSTIC SODA CONCENTRATION AND TEMPERATURE WHICH PROVIDE A TRIHYDRATE EXTRACTION POTENTIAL IN THE LIQUOR BUT NOT A MONOHYDRATE EXTRACTION POTENTIAL THROUGHOUT DIGESTION OF THE SECOND MENTIONED ORE CHARGE THEREBY SUBSTANTIALLY COMPLETELY EXTRACTING THE TRIHYDRATE ALUMINA CONTENT OF SAID SECOND ORE CHARGE.
Claim 2
Dependent Claim
143 words
AN IMPROVED WET CAUSTIC ALUMINATE PROCESS FOR THE PRODUCTION OF ALUMINA FROM ORES CONTAINING CAUSTIC SOLUBLE MONOHYDRATE AND TRIHYDRATE ALUMINA COMPRISING THE STEPS OF SUBJECTING A CHARGE OF A MONOHYDRATE ALUMINA-CONTAINING ORE TO AN INITIAL DIGESTION IN CAUSTIC ALUMINATE LIQUOR HAVING A CAUSTIC SODA CONCENTRATION AND TEMPERATURE WHICH PROVIDE A MONOHYDRATE EXTRACTION POTENTIAL IN THE LIQUOR THROUGHOUT SAID DIGESTION THEREBY SUBSTANTIALLY COMPLETELY EXTRACTING THE ALUMINA OF THE ORE CHARGE, AND THEREAFTER SUBSTANTIALLY INCREASING THE DISSOLVED ALUMINA CONTENT OF THE LIQUOR BY DIGESTING THEREIN A CHARGE OF AN ORE, THE SOLUBLE ALUMINA CONTENT OF WHICH IS AT LEAST PREDOMINANTLY TRIHYDRATE, UNDER CONDITIONS OF CAUSTIC SODA CONCENTRATION AND TEMPERATURE WHICH PROVIDE A TRIHYDRATE EXTRACTION POTENTIAL IN THE LIQUOR BUT NOT A MONOHYDRATE EXTRACTION POTENTIAL THROUGHOUT DIGESTION OF THE SECOND MENTIONED ORE CHARGE THEREBY SUBSTANTIALLY COMPLETELY EXTRACTING THE TRIHYDRATE ALUMINA CONTENT OF SAID SECOND ORE CHARGE.
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US2066209A
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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) | 1958-02-07 | 1958-08-09 | 1959-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-07 | 1962-08-09 | 1963-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-07 | 1966-08-09 | 1967-02-08 | $7700.00 | Window Closed / Lapsed |