Patent US3761388A successfully refreshed from Google Patents.
US3761388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lube oil hydrotreating process
Assignee: Gulf Research and Development Co
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Filing: 1971-10-20
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Granted: 1973-09-25
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Expires: 1991-10-20
Abstract
Abstract A PROCESS FOR PRODUCING LUBRICATING OILS WITH AN IMPROVED YIELD AND VISCOSTIY-VISCOSITY INDEX DISTRIBUTION FROM A WIDE BOILING RANGE CRUDE LUBRICATING OIL BY SUBJECTING THE CRUDE LUBRICATING OIL TO A HYDROTREATMENT IN A SERIES OF REACTIN ZONES. A PORTION OF THE EFFLUENT FROM THE EARLIER ZONES IN THE SERIES IS REMOVED FOR THE RECOVERY OF HEAVIER LUBRICATING OIL STOCK THEREFROM WHILE THE BALANCE OF THE EFFLUENET IS PASSED TO THE REMAINING REACTION ZONES IN THE SERIES FOR THE PRODUCTION OF LIGHTER LUBRICATING OIL STOCKS.
Inventors
- 👤 M Bryson
- 👤 H Stauffer
- 👤 T Torkos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:01
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/04; C10G2400/00; C10G2400/10
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |