US3772169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil compositions
Assignee: Shell USA Inc
•
Filing: 1972-02-24
•
Granted: 1973-11-13
•
Expires: 1992-02-24
Abstract
Abstract The gelling tendency of lubricating oil solutions containing selectively hydrogenated random styrene/butadiene copolymers is minimized by the presence of a polyester of an olefinically unsaturated acid.
Inventors
- 👤 N Small
- 👤 C Edhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:00
CPC Classifications
C; C10; C10M; C10M157/00; C10M2205/00; C10M2205/06; C10M2207/00; C10M2207/10; C10M2207/14; C10M2207/144; C10M2207/146; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/086; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/24; C10M2215/26; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/023; 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
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
23 words
An oil composition according to claim 1 in which the kinetic molecular weight of the random copolymer is between 40, 000 and 100,000.
Claim 2
Dependent Claim
14 words
An oil composition according to claim 1 in which the acid is methacrylic acid.
Claim 3
Dependent Claim
22 words
An oil composition according to claim 1 in which the alkyl chains in the polyester contain from 9 to 18 carbon atoms.
Claim 4
Dependent Claim
33 words
An oil composition according to claim 1 in which the polyester is derived from mixtures of esters containing an average number of carbon atoms in the alkyl chains of from 12 to 15.
Claim 5
Dependent Claim
24 words
An oil composition according to claim 1 in which the amount of hydrogenated random butadiene-styrene copolymer is from 5 to 20 percent w thereof.
Claim 6
Dependent Claim
22 words
An oil composition according to claim 1 in which the amount of oil-soluble polyester is from 0.1 to 0.5 percent w thereof.
References Cited (Backward Citations)
US3679644A
Cited
US3554911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |