Patent US3264061A successfully refreshed from Google Patents.
US3264061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina product and its method of preparation
Assignee: Gulf Research and Development Co
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Filing: 1962-12-21
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Granted: 1966-08-02
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Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 William L Kehl
- 👤 Meredith M Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:41
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; C01P; C01P2002/00; C01P2002/02; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14; C01P2006/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
A PROCESS FOR THE PREPARATION OF ALUMINA COMPRISING ADDING AN AQUEOUS SOLUTION OF AN ACIDIC ALUMINUM SALT WHICH IS SUBSTANTIALLY FREE OF METALS OTHER THAN ALUMINUM TO A SUBSTANTIALLY METAL FREE AQUEOUS SOLUTION OF AMMONIUM BICARBONATE, MAINTAINING THE MIXTURE AT A PH BETWEEN 7 AND 9 THROUGHOUT SUBSTANTIALLY THE ENTIRE PROCEDURE AND SUBSTANTIALLY PREVENTING ANY PH IN THE MIXTURE BELOW 7 OR ABOVE 9, PRECIPITATING ALUMINA HYDRATE, HEAT TREATING SAID ALUMINA HYDRATE TO A TEMPERATURE ABOVE ABOUT 350**F. BUT BELOW ABOUT 1400*F., AND CONTACTING SAID ALUMINA WITH LIQUID WATER TO ACCOMPLISH CHEMICAL REHYDRATION THEREOF.
Claim 2
Dependent Claim
94 words
A PROCESS FOR THE PREPARATION OF ALUMINA COMPRISING ADDING AN AQUEOUS SOLUTION OF AN ACIDIC ALUMINUM SALT WHICH IS SUBSTANTIALLY FREE OF METALS OTHER THAN ALUMINUM TO A SUBSTANTIALLY METAL FREE AQUEOUS SOLUTION OF AMMONIUM BICARBONATE, MAINTAINING THE MIXTURE AT A PH BETWEEN 7 AND 9 THROUGHOUT SUBSTANTIALLY THE ENTIRE PROCEDURE AND SUBSTANTIALLY PREVENTING ANY PH IN THE MIXTURE BELOW 7 OR ABOVE 9, PRECIPITATING ALUMINA HYDRATE, HEAT TREATING SAID ALUMINA HYDRATE TO A TEMPERATURE ABOVE ABOUT 350**F. BUT BELOW ABOUT 1400*F., AND CONTACTING SAID ALUMINA WITH LIQUID WATER TO ACCOMPLISH CHEMICAL REHYDRATION THEREOF.
Claim 3
Dependent Claim
70 words
A PROCESS COMPRISING HEAT TREATING AN ALUMINA HYDRATE HAVING ABOUT 1.2 TO 2.6 MOLES OF WATER OF HYDRATION PER MOLE OF ALUMINA AND THE APPROXIMATE CYSTALLINE CONFIGURATION AS DETERMINED BY X-RAY DIFFRACTION OF A CUBE 8.2 A. ON EDGE AT A TEMPERATURE BETWEEN 350*F. AND 1400*F., CONTACTING SAID HEAT TREATED ALUMINA WITH WATER TO ACCOMPLISH REHYDRATION THEREOF, AND CALCINING SAID REHYDRATED ALUMINA AT A TEMPERATURE BETWEEN ABOUT 750*F. AND 1500*F.
Claim 4
Dependent Claim
70 words
A PROCESS COMPRISING HEAT TREATING AN ALUMINA HYDRATE HAVING ABOUT 1.2 TO 2.6 MOLES OF WATER OF HYDRATION PER MOLE OF ALUMINA AND THE APPROXIMATE CYSTALLINE CONFIGURATION AS DETERMINED BY X-RAY DIFFRACTION OF A CUBE 8.2 A. ON EDGE AT A TEMPERATURE BETWEEN 350*F. AND 1400*F., CONTACTING SAID HEAT TREATED ALUMINA WITH WATER TO ACCOMPLISH REHYDRATION THEREOF, AND CALCINING SAID REHYDRATED ALUMINA AT A TEMPERATURE BETWEEN ABOUT 750*F. AND 1500*F.
Claim 5
Dependent Claim
9 words
THE ALUMINA PREPARED BY THE METHOD OF CLAIM 8.
References Cited (Backward Citations)
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Cited
US1929942A
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US2528751A
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US2659660A
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US2881051A
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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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |