Patent US3557025A successfully refreshed from Google Patents.
US3557025A
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Method of producing alkalized alumina and products produced thereby
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1968-05-13
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Granted: 1971-01-19
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Expires: 1988-05-13
Abstract
Abstract AN IMPROVED ALKALIZED ALUMINA CAPABLE OF ABSORBING SO2 IS PREPARED FROM SELECTIVELY CALCINED ALUMINA WHICH IS CAPABLE OF AT LEAST PARTIAL REHYDRATION, BY CONTACTING THE ALUMINA WITH AN MHCO3 COMPOUND, WHEREIN M IS SELECTED FROM ALKALI METALS AND NH4 RADICAL TO FORM AT LEAST ABOUT 30% BY WEIGHT ALKALIZED ALUMINA HAVING THE EMPIRICAL FORMULA OF MA1(OH)2CO3.
Inventors
- 👤 Robert B Emerson
- 👤 Wilton A Brian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:11
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; C; C01; C01F; C01F7/00; C01F7/78; C01F7/782
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |