US3013980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivation of spent isomerization catalysts
Assignee: Pure Oil Co
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Filing: 1957-12-23
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Granted: 1961-12-19
•
Expires: 1977-12-23
Abstract
No abstract record available.
Inventors
- 👤 Norman L Carr
- 👤 Brozowski Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:11
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/96
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
IN THE REACTIVATION OF A SPENT ISOMERIZATION CATALYST COMPRISING A CATALYST PROMOTER SELECTED FROM THE GROUP CONSISTING OF GROUP VIII NOBLE METALS ON AN ACIDIC SILICAALUMINA SUPPORT, THE STEPS OF OXIDIZING SAID CATALYST IN AN ATMOSPHERE OF OXYGEN-CONTAINING GAS FOR A TIME SUFFICIENT TO OXIDIZE COMPLETELY ALL CONTAMINANTS ON SAID CATALYST AND TO OXIDIZE SAID CATALYST PROMETER, FOLLOWED BY REDUCTION OF THE CATALYST IN A HYDROGEN-RICH ATMOSPHERE FOR A TIME SUFFICIENT TO REDUCE SAID CATALYST PROMOTER COMPLETELY, THE TEMPERATURE AND WATER VAPOR PARTIAL PRESSURE OF SAID ATMOSPHERES BEING MAINTAINED AT VALUES WITHIN THE AREA DEFINED BY A-E-F-D ON THE ACCOMPANYING DRAWING, AND LIMITING THE TIME TO NOT MORE THAN ABOUT ONE HOUR DURING WHICH THE CATALYST IS SUBJECTED IN THE OXIDIZING AND REDUCING ATMOSPHERES TO TEM-
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) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |