Patent US3565820A successfully refreshed from Google Patents.
US3565820A
Expired / Lapsed
US
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Regeneration of catalysts used in residual oil hydroprocessing
Assignee: Texaco Inc
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Filing: 1969-06-19
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Granted: 1971-02-23
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Expires: 1989-06-19
Abstract
Abstract CATALYSTS USED IN RESIDUAL OIL HYDROPROCESSING HAVE THEIR ACTIVITIES RESTORED BY CONTACTING WITH A DISTILLATE OIL AT ABOUT 600 TO 800*F. AND 0 TO 3000 P.S.I.G. OPTIONALLY IN THE PRESENCE OF HYDROGEN; PURGING WITH HYDROGEN AND THEN WITH NITROGEN; STEAMING AT ABOUT 400 TO 800*F. AND BURNING WITH AN AIR STEAM MIXTURE AT A TEMPERATURE BELOW ABOUT 800*F.
Inventors
- 👤 William R Coons Jr
- 👤 Gerald V Nelson
- 👤 Glenn C Wray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:55
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/94; C; C10; C10G; C10G2300/00; C10G2300/10; C10G2300/107
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |