US3642633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant compositions
Assignee: Shell USA Inc
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Filing: 1969-12-31
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Granted: 1972-02-15
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Expires: 1989-12-31
Abstract
Abstract LUBRICANT COMPOSITION CONTAINING COPOLYMERS HAVING FREE HYDROXYL GROUPS AND DERIVED FROM A COMPOUND COMPRISING A SINGLE POLYMERIZABLE C=C GROUP AND AT LEAST ONE AROMATIC RING WHICH IS INCORPORATED INTO THE MONOMER MIXTURE FROM WHICH THE COPOLYMERS ARE POLYMERIZED HAVE IMPROVED POUR POINTS, VISCOSITY INDICES AND DISPERSANT PROPERTIES.
Inventors
- 👤 Rudolf J A Eckert
- 👤 Johannes M Wortel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:20
CPC Classifications
C; C10; C10M; C10M149/00; C10M149/02; C10M149/10; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F8/00; C08F8/14; C10M145/00; C10M145/02; C10M145/10; C10M145/12; C10M145/14; C10M145/16; C10M2205/00; C10M2205/04; C10M2207/00; C10M2207/40; C10M2207/404; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/082; C10M2209/084; C10M2209/086; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06; C10N; 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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |