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US2981600A
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US
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Process of purifying caustic aluminate liquors
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1952-12-01
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Granted: 1961-04-25
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Expires: 1972-12-01
Abstract
No abstract record available.
Inventors
- 👤 John L Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:29
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/46; C01F7/47; C01F7/473
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A CONTINUOUS PROCESS FOR PRODUCTION OF ALUMINA FROM ALUMINOUS MATERIALS ORGANIC MATTER, WHICH COMPRISES DIGESTING SAID ALUMINOUS MATERIALS IN RECYCLED SPENT CAUSTIC ALUMINATE LIQUOR, REMOVING THE INSOLUBLE RESIDUES OF SAID ALUMINOUS MATERIAL FROM THE DIGESTION LIQUOR BY SETTING WITH ADDITION OF STARCH AS A FLOUCCULATING AGENT, SAID STARCH AND SAID ORGANIC MATTER OF THE ALUMINOUS MATERIAL FORMING SODIUM ORGANIC COMPOUNDS AND SODIUM CARBONATE IN THE LIQUOR, RECOVERING ALUMINA BY PRECIPITATION FROM THE CLARIFIED LIQUOR, CONCENTRATING THE SPENT LIQUOR TO A CAUSTIC SODA CONCENTRATION SUFFICIENT TO PRECIPITATE A GELATINOUS SLUDGE OF SODIUM ORGANIC COMPOUNDS AND SODIUM CARBONATE WHEREBY TO PREVENT ACCUMULATION THEREOF IN THE LIQUOR IN AMOUNT
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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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |