US2559653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of alumina from alumina-containing ores
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1948-10-06
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Granted: 1951-07-10
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Expires: 1968-10-06
Abstract
No abstract record available.
Inventors
- 👤 Cloise L Mooney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:49
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A CONTINUOUS PROCESS FOR EXTRACTING ALUMINA FROM ALUMINOUS MATERIAL IN WHICH THE MATERIAL IS PRESSURE DIGESTED AT ELEVATED TEMPERATURES WITH CAUSTIC LIQUOR UNTIL SUBSTANTIALLY ALL OF THE AVAILABLE ALUMINA IS IN SOLUTION, THE DIGESTED SLURRY IS COOLED TO A SELECTED LOWER TEMPERATURE AND THE INSOLUBLE RESIDUE IS REMOVED FROM THE GREEN LIQUOR HAVING AN ALUMINA-TO-CAUSTIC RATIO REPRESENTING SUBSTANTIALLY THE PERMISSIBLE MAXIMUM AT THE SELECTED LOWER TEMPERATURE WITHOUT CAUSING LOSS OF ALUMINA BY PREMATURE PRECIPITATION, THE IMPROVEMENT OF INCREASING UNIT PRODUCTION WITHOUT INCREASING UNIT DIGESTER CA-
Claim 2
Dependent Claim
86 words
IN A CONTINUOUS PROCESS FOR EXTRACTING ALUMINA FROM ALUMINOUS MATERIAL IN WHICH THE MATERIAL IS PRESSURE DIGESTED AT ELEVATED TEMPERATURES WITH CAUSTIC LIQUOR UNTIL SUBSTANTIALLY ALL OF THE AVAILABLE ALUMINA IS IN SOLUTION, THE DIGESTED SLURRY IS COOLED TO A SELECTED LOWER TEMPERATURE AND THE INSOLUBLE RESIDUE IS REMOVED FROM THE GREEN LIQUOR HAVING AN ALUMINA-TO-CAUSTIC RATIO REPRESENTING SUBSTANTIALLY THE PERMISSIBLE MAXIMUM AT THE SELECTED LOWER TEMPERATURE WITHOUT CAUSING LOSS OF ALUMINA BY PREMATURE PRECIPITATION, THE IMPROVEMENT OF INCREASING UNIT PRODUCTION WITHOUT INCREASING UNIT DIGESTER CA-
References Cited (Backward Citations)
US2143310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |