US3764558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant low oxygen concentration gas regeneration of refining catalysts
Assignee: Sunoco Inc
•
Filing: 1971-06-24
•
Granted: 1973-10-09
•
Expires: 1991-06-24
Abstract
Abstract Regeneration of highly coked hydrogenation catalysts using an inert gas and a constant 0.2 to 0.4 percent oxygen at from 775*F. to 850*F.
Inventors
- 👤 H Tse
- 👤 W Seitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:12
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/12; B01J37/14; B01J23/00; B01J23/90; B01J23/94; C; C10; C10G; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; C10G45/44; C10G45/46; C10G45/48; C10G45/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2813835A
Cited
US2963425A
Cited
GB1021966A
Cited
US3533960A
Cited
US3505207A
Cited
US3565820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |