US3775329A
Expired / Lapsed
US
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Lubricant compositions containing a viscosity index improver
Assignee: Shell USA Inc
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Filing: 1971-11-04
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Granted: 1973-11-27
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Expires: 1991-11-04
Abstract
Abstract THE VISCOSITY INDEX OF LUBRICATING OILS IS SUBSTANTIALLY INCREASED BY THE PRESENCE OF A MINOR AMOUNT OF A HYDROGENATING TAPERED COPOLYMER OF ISOPRENE AND A MONOVINYL AROMATIC COMPOUND.
Inventors
- 👤 R Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:12
CPC Classifications
C; C10; C10M; C10M143/00; C10M143/12; C08; C08C; C08C19/00; C08C19/02; C08F; C08F8/00; C08F8/04; C10M2203/00; C10M2203/10; C10M2203/102; C10M2205/00; C10M2205/06; C10M2207/00; C10M2207/10; C10M2207/14; C10M2207/144; C10M2207/146; C10M2207/40; C10M2207/404; C10M2209/00; C10M2209/02; C10M2209/04; C10M2209/06; C10M2209/062; C10M2209/08; C10M2209/082; C10M2209/084; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/24; C10M2215/26; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2050/00; C10N2050/10; C10N2070/00; C10N2070/02
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |