US3663422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of very high vi lubricating oils by hydrotreating
Assignee: Shell USA Inc
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Filing: 1969-08-28
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Granted: 1972-05-16
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Expires: 1989-08-28
Abstract
Abstract VERY HIGH VISCOSITY INDEX (VI>125 LUBRICATING OILS ARE PRODUCED BY HYDROTREATING SOLVENT-REFINED, ASPHALTFREE WAXY HYDROCARBONS IN THE PRESENCE OF A SUITABLE CATALYST UNDER SPECIFIC HYDROTREATING CONDITIONS. A TRUE SAE 10W/30 MULIGRADE OIL IS PRODUCED WHICH DOES NOT REQUIRE THE ADDITION OF VI IMPROVES OR THICKENERS.
Inventors
- 👤 Peter W Dun
- 👤 J Van Formijn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:55
CPC Classifications
C; C10; C10M; C10M101/00; C10M101/02; C10G; C10G2400/00; C10G2400/10; C10M2203/00; C10M2203/10; C10M2203/102; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/027; C10M2207/10; C10M2207/16; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2215/00; C10M2215/086; C10M2215/24; C10M2215/28; C10M2219/00; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2050/00; C10N2050/015; C10N2050/02
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |