Patent US3222129A successfully refreshed from Google Patents.
US3222129A
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Method for producing active alumina nodules
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1962-02-26
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Granted: 1965-12-07
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Expires: 1982-02-26
Abstract
No abstract record available.
Inventors
- 👤 Harry E Osment
- 👤 Robert B Emerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:17
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/021; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; C01F7/44; C01F7/441; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14; C01P2006/16; C01P2006/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A METHOD FOR PRODUCING NODULES OF ACTIVE ALUMINA BY PARTIALLY CALCINING ALUMINA HYDRATE PARTICLES TO A TRANSITION ALUMINA, GRINDING THE PARTIALLY CALCINED PARTICLES, MIXING THE GROUND PARTICLES WITH WATER TO FORM NODULES, CURING THE RESULTANT NODULES AND HEAT TREATING THE SAME TO ACTIVATE, THE IMPROVEMENT IN THE PARTIAL CALCINING STEP COMPRISING: (A) SURROUNDING THE ALUMINA HYDRATE PARTICLES WITH A FUEL-AIR MIXTURE; (B) PASSING THE ALUMINA HYDRATE PARTICLES SURROUNDED WITH THE FUEL-AIR MIXTURE THROUGH A COMBUSTION ZONE AT A FLAME TEMPERATURE IN THE RANGE OF 3000*F. TO 3500*F. FOR A PERIOD OF TIME TO ENSURE THAT EACH PARTICLE IS PARTIALLY CALCINED; (C) QUENCHING THE PARTIALLY CALCINED PRODUCT PRIOR TO GRINDING.
Claim 2
Dependent Claim
110 words
IN A METHOD FOR PRODUCING NODULES OF ACTIVE ALUMINA BY PARTIALLY CALCINING ALUMINA HYDRATE PARTICLES TO A TRANSITION ALUMINA, GRINDING THE PARTIALLY CALCINED PARTICLES, MIXING THE GROUND PARTICLES WITH WATER TO FORM NODULES, CURING THE RESULTANT NODULES AND HEAT TREATING THE SAME TO ACTIVATE, THE IMPROVEMENT IN THE PARTIAL CALCINING STEP COMPRISING: (A) SURROUNDING THE ALUMINA HYDRATE PARTICLES WITH A FUEL-AIR MIXTURE; (B) PASSING THE ALUMINA HYDRATE PARTICLES SURROUNDED WITH THE FUEL-AIR MIXTURE THROUGH A COMBUSTION ZONE AT A FLAME TEMPERATURE IN THE RANGE OF 3000*F. TO 3500*F. FOR A PERIOD OF TIME TO ENSURE THAT EACH PARTICLE IS PARTIALLY CALCINED; (C) QUENCHING THE PARTIALLY CALCINED PRODUCT PRIOR TO GRINDING.
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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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |