Patent US3793186A successfully refreshed from Google Patents.
US3793186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lube oil improvement
Assignee: Chevron USA Inc
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Filing: 1971-07-19
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Granted: 1974-02-19
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Expires: 1991-07-19
Abstract
Abstract A process for improving the ASTM color of lube stocks which comprises contacting crude lube stock, at a temperature between 400* and 850*F., a pressure between 100 and 3000 psig, and in the presence of gaseous hydrogen, with a hydrofining catalyst having a mean pore diameter of at least 140 A. Preferred hydrofining catalysts include compositions containing Group VIB or Group VIII metals and a refractory support and dispersed metal phosphate particles such as titanium phosphate.
Inventors
- 👤 L Guenther
- 👤 A Bridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:33
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/188; C; C10; C10G; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
18 words
A process in accordance with claim 1 wherein the crude lube stock is a vacuum distillation bottoms product.
References Cited (Backward Citations)
US2779711A
Cited
US3067128A
Cited
US3242101A
Cited
US3472763A
Cited
US3393148A
Cited
US3493517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |