US2939848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength alumina pellets
Assignee: Standard Oil Co
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Filing: 1957-06-20
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Granted: 1960-06-07
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Expires: 1977-06-20
Abstract
No abstract record available.
Inventors
- 👤 Russell V Malo
- 👤 Harry M Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:33
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J21/00; B01J21/02; B01J21/04; B01J21/16; B01J23/70; B01J37/00; B01J37/02; B01J37/0201
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
A METHOD FOR PREPARING ALUMINA PELLETS HAVING INCREASED CRUSHING STRENGTH WHICH COMPRISES IMMERSING CALCINED ALUMINA PELLETS, SAID PELLETS BEING PREDOMINANTLY GAMMA ALUMINA AND SUBSTANTIALLY FREE OF ALPHA ALUMINA, IN A SOLUTION AN ALKALINE SUBSTANCE HAVING A PH IN THE RANGE OF ABOUT 8 TO 12 AND AN IONIZATION CONSTANT LESS THAN ABOUT 10**-2 AT 25*C. FOR A PERIOD IN EXCESS OF ABOUT 0.5 HOUR AT A TEMPERATURE IN EXCESS OF ABOUT 150* F., AND CALCINING THE RESULTING PELLETS AT A TEMPERATURE BETWEEN ABOUT 600 AND 1400* F.
Claim 2
Independent Claim
87 words
A METHOD FOR PREPARING ALUMINA PELLETS HAVING INCREASED CRUSHING STRENGTH WHICH COMPRISES IMMERSING CALCINED ALUMINA PELLETS, SAID PELLETS BEING PREDOMINANTLY GAMMA ALUMINA AND SUBSTANTIALLY FREE OF ALPHA ALUMINA, IN A SOLUTION AN ALKALINE SUBSTANCE HAVING A PH IN THE RANGE OF ABOUT 8 TO 12 AND AN IONIZATION CONSTANT LESS THAN ABOUT 10**-2 AT 25*C. FOR A PERIOD IN EXCESS OF ABOUT 0.5 HOUR AT A TEMPERATURE IN EXCESS OF ABOUT 150* F., AND CALCINING THE RESULTING PELLETS AT A TEMPERATURE BETWEEN ABOUT 600 AND 1400* F.
Claim 3
Dependent Claim
22 words
THE METHOD OF CLAIM 1 WHEREIN SAID CALCINED GAMMA-ALUMINA PELLETS CONTAIN ABOUT 0.01 TO 1 WEIGHT PERCENT PLATINUM, BASED ON DRY AL203.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |