US2983690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-surface-area alumina and catalysts containing same
Assignee: Standard Oil Co
•
Filing: 1958-04-29
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Granted: 1961-05-09
•
Expires: 1978-04-29
Abstract
No abstract record available.
Inventors
- 👤 Ralph J Bertolacini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:26
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
A METHOD OF PREPARING ALUMINA OF INCREASED SURFACE AREA WHICH COMPRISES IRRADIATING HYDROUS ALUMINA WITH GAMMA RAYS TO DOSAGE LEVELS OF AT LEAST ABOUT 102 RAD, THEREAFTER DRYING AND CALCINING.
Claim 2
Independent Claim
30 words
A METHOD OF PREPARING ALUMINA OF INCREASED SURFACE AREA WHICH COMPRISES IRRADIATING HYDROUS ALUMINA WITH GAMMA RAYS TO DOSAGE LEVELS OF AT LEAST ABOUT 102 RAD, THEREAFTER DRYING AND CALCINING.
Claim 3
Independent Claim
67 words
A METHOD OF PREPARING HALIDE-CONTAINING PLATINUMALUMINA CATALYST OF INCREASED SURFACE AREA AND IMPROVED HALIDE RETENTION WHICH COMPRISES IRRADIATING HYDROUS ALUMINA WITH GAMMA RAYS TO A DOSAGE LEVEL OF ABOUT 104 TO 1012 RAD, DRYING AND CALCINING THE RESULTING HYDROUS ALUMINA, AND INTRODUCING INTO THE DRIED AND CALCINED ALUMINA ABOUT 0.01 TO 1.0 PERCENT BY WEIGHT OF PLATINUM AND ABOUT 0.05 TO 2 PERCENT BY WEIGHT OF HALOGEN.
Claim 4
Independent Claim
67 words
A METHOD OF PREPARING HALIDE-CONTAINING PLATINUMALUMINA CATALYST OF INCREASED SURFACE AREA AND IMPROVED HALIDE RETENTION WHICH COMPRISES IRRADIATING HYDROUS ALUMINA WITH GAMMA RAYS TO A DOSAGE LEVEL OF ABOUT 104 TO 1012 RAD, DRYING AND CALCINING THE RESULTING HYDROUS ALUMINA, AND INTRODUCING INTO THE DRIED AND CALCINED ALUMINA ABOUT 0.01 TO 1.0 PERCENT BY WEIGHT OF PLATINUM AND ABOUT 0.05 TO 2 PERCENT BY WEIGHT OF HALOGEN.
References Cited (Backward Citations)
US2582428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |