Patent US3725245A successfully refreshed from Google Patents.
US3725245A
Expired / Lapsed
US
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Production of lubricating oils
Assignee: Texaco Inc
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Filing: 1970-12-02
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Granted: 1973-04-03
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Expires: 1990-12-02
Abstract
Abstract LUBRICATING OILS OF IMPROVED PROPERTIES ARE PREPARED BY TOPPING A CRUDE UNDER ATMOSPHERIC PRESSURE, DEASPHALTING THE REDUCED CRUDE, HYDROGENATING THE DEASPHALTED OIL AND DISTILLING THE HYDROGENATION PRODUCT UNDER REDUCED PRESSURE TO RECOVER LUBE OIL DISTILLATES. THE VACUUM RESIDMAY ALSO BE SOLVENT DEASPHALTED TO PRODUCE ADDITIONAL HEAVIER GRADE LUBRICANTS.
Inventors
- 👤 R Woodle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:50
CPC Classifications
C; C10; C10G; C10G7/00; 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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |