US3223483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing active alumina
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1962-06-14
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Granted: 1965-12-14
•
Expires: 1982-06-14
Abstract
No abstract record available.
Inventors
- 👤 Harry E Osment
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:46
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/46; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J21/00; B01J21/16; C01F7/44; C01F7/441; C01P; C01P2004/00; C01P2004/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN THE METHOD OF PRODUCING ALUMINA MATERIAL BY SELECTIVELY CALCINING ALUMINA TRIHYDRATE TO OBTAIN A TRANSITION ALUMINA CAPABLE OF AT LEAST PARTIAL REHYDRATION, AGGLOMERATING THE SELECTIVELY CALCINED ALUMINA BY MIXING WITH WATER, REHYDRATING THE ALUMINA AGGLOMERATES AND THEN HEATING SAID REHYDRATED AGGLOMERATES, THE IMPROVEMENT FOR PRODUCING A MATERIAL OF LOW SODIUM CONTENT WHICH COMPRISES THE FOLLOWING PROCEDURE FOR SAID REHYDRATION: (A) ONLY PARTIALLY REHYDRATING THE ALUMINA AGGLOMERATES; (B) CIRCULATING WATER OF LOW SODIUM CONTENT THROUGH THE PARTIALLY REHYDRATED ALUMINA AGGLOMERATES TO REMOVE SOLUBLE SODIUM COMPOUNDS THEREFROM AND LOWER THE SODIUM CONTENT THEREOF WHILE CONTINUING THE REHYDRATION OF THE PARTIALLY REHYDRATED ALUMINA AGGLOMERATES.
Claim 2
Dependent Claim
102 words
IN THE METHOD OF PRODUCING ALUMINA MATERIAL BY SELECTIVELY CALCINING ALUMINA TRIHYDRATE TO OBTAIN A TRANSITION ALUMINA CAPABLE OF AT LEAST PARTIAL REHYDRATION, AGGLOMERATING THE SELECTIVELY CALCINED ALUMINA BY MIXING WITH WATER, REHYDRATING THE ALUMINA AGGLOMERATES AND THEN HEATING SAID REHYDRATED AGGLOMERATES, THE IMPROVEMENT FOR PRODUCING A MATERIAL OF LOW SODIUM CONTENT WHICH COMPRISES THE FOLLOWING PROCEDURE FOR SAID REHYDRATION: (A) ONLY PARTIALLY REHYDRATING THE ALUMINA AGGLOMERATES; (B) CIRCULATING WATER OF LOW SODIUM CONTENT THROUGH THE PARTIALLY REHYDRATED ALUMINA AGGLOMERATES TO REMOVE SOLUBLE SODIUM COMPOUNDS THEREFROM AND LOWER THE SODIUM CONTENT THEREOF WHILE CONTINUING THE REHYDRATION OF THE PARTIALLY REHYDRATED ALUMINA AGGLOMERATES.
References Cited (Backward Citations)
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US2378155A
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US2405275A
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US2881051A
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US2876068A
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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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |