US3763033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lube oil hydrotreating process
Assignee: Gulf Research and Development Co
•
Filing: 1971-10-20
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Granted: 1973-10-02
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Expires: 1991-10-20
Abstract
Abstract A process for producing lubricating oils in order to obtain lubricating oils of enhanced viscosity index by hydrotreating various crude lubricating oil fractions separately.
Inventors
- 👤 H Stauffer
- 👤 J Strom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:04
CPC Classifications
C; C10; C10G; C10G45/00; C10G49/00; C10G49/22; C10G65/00; C10G65/14; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
The process of claim 1 wherein the fractionations are conducted so as to separate a fraction comprising the lowest boiling lubricating oil boiling range components from the higher boiling lubricating oil boiling range components and the higher boiling lubricating oil components are recovered as product.
Claim 2
Dependent Claim
112 words
The process of claim 1 wherein the hydrotreating conditions are selected so as to maintain a yield from each hydrotreating operation of at least about 50 percent by volume of hydrotreated material boiling above about 625* F. based upon charge to the hydrotreating operation, to maintain at least 22 mol percent of the normally liquid effluent from each hydrotreating operation in the form of materials boiling above about 625* F. and to maintain a hydrogen consumption, measured as standard cubic feet per barrel of charge stock, in each hydrotreating operation at less than about the product of 30 multiplied by the volume percent of 625* F.+ material in the normally liquid effluent.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |