Patent US4625722A successfully refreshed from Google Patents.
US2968635A
Expired / Lapsed
US
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Activated alumina and the use thereof
Assignee: Universal Oil Products Co
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Filing: 1958-09-19
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Granted: 1961-01-17
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Expires: 1978-09-19
Abstract
No abstract record available.
Inventors
- 👤 William G Nixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:44
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/44; C01F7/441; B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/38; B01J23/40; B01J23/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
A METHOD OF PREPARING ALUMINA OF IMPROVED SURFACE-AREA CHARACTERISTICS WHICH COMPRISES CONTACTING ALUMINA HYDROGEL WITH GASEOUS AMMONIA AT AT TEMPERATURE IN EXCESS OF 25* C. AND THEREAFTER CALCINING THE ALUMINA.
Claim 2
Independent Claim
30 words
A METHOD OF PREPARING ALUMINA OF IMPROVED SURFACE-AREA CHARACTERISTICS WHICH COMPRISES CONTACTING ALUMINA HYDROGEL WITH GASEOUS AMMONIA AT AT TEMPERATURE IN EXCESS OF 25* C. AND THEREAFTER CALCINING THE ALUMINA.
Claim 3
Independent Claim
63 words
A METHOD FOR MANUFACTUREING AN ALUMINA HYDROGEL PLATINUM CATALYST WHICH COMPRISES PREPARING ALUMINA HYDROGEL, CONTACTING SAID ALUMINA WITH GASEOUS AMMONIA AT A TEMPERATURE OF FROM ABOUT 100*C. TO ABOUT 600* C., REMOVING SAID AMMONIA FROM THE ALUMINA AND SUBJECTING THE LATTER TO A CALCINING TREATMENT AT ELEVATED TEMPERATURES, COMPOSITION PLATINUM WITH SAID CALCINED ALUMINA AND THEREAFTER DRYING AND CALCINING THE RESULTING ALUMINA-PLATINUM COMPOSITE.
Claim 4
Independent Claim
63 words
A METHOD FOR MANUFACTUREING AN ALUMINA HYDROGEL PLATINUM CATALYST WHICH COMPRISES PREPARING ALUMINA HYDROGEL, CONTACTING SAID ALUMINA WITH GASEOUS AMMONIA AT A TEMPERATURE OF FROM ABOUT 100*C. TO ABOUT 600* C., REMOVING SAID AMMONIA FROM THE ALUMINA AND SUBJECTING THE LATTER TO A CALCINING TREATMENT AT ELEVATED TEMPERATURES, COMPOSITION PLATINUM WITH SAID CALCINED ALUMINA AND THEREAFTER DRYING AND CALCINING THE RESULTING ALUMINA-PLATINUM COMPOSITE.
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) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |