Patent US3947368A successfully refreshed from Google Patents.
US3947368A
Expired / Lapsed
US
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Lubricating oil compositions
Assignee: Texaco Inc
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Filing: 1971-02-25
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Granted: 1976-03-30
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Expires: 1991-02-25
Abstract
Abstract Lubricating oil compositions having substantially reduced pour points are prepared by incorporating an effective pour depressant amount of an oil-soluble copolymer of ethylene and a vinyl ester of a lower saturated monobasic aliphatic carboxylic acid in a paraffinic, waxy-type, residual lubricating oil base stock. The copolymers, in which the lower saturated monobasic carboxylic component of the ester has from 2 to 6 carbon atoms, have molecular weights of about 16,000 to about 31,000 and which contain about 17 to about 42 weight percent of the vinyl ester, can be added to the lubricating base stock in the form of an emulsion, as a hydrocarbon solution or in any other convenient manner.
Inventors
- 👤 William M. Sweeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:57
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2203/00; C10M2203/10; C10M2203/108; C10M2209/00; C10M2209/02; C10M2209/04; C10M2209/06; C10M2209/062
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A lubricating oil composition having improved pour point characteristics which comprises a paraffinic, waxy-type, residual lubricating oil base stock and about 0.01 to about 0.50 percent by weight of an oil-soluble copolymer of ethylene and a vinyl ester of a saturated monobasic aliphatic carboxylic acid in which the carboxylic acid component of the ester has from 2 to 6 carbon atoms, said copolymer having a molecular weight of about 16,000 to about 31,000, a vinyl ester content of about 12 to about 42 percent by weight, and a melt index of about 5 to about 580.
Claim 2
Dependent Claim
96 words
A lubricating oil composition having improved pour point characteristics which comprises a paraffinic, waxy-type, residual lubricating oil base stock and about 0.01 to about 0.50 percent by weight of an oil-soluble copolymer of ethylene and a vinyl ester of a saturated monobasic aliphatic carboxylic acid in which the carboxylic acid component of the ester has from 2 to 6 carbon atoms, said copolymer having a molecular weight of about 16,000 to about 31,000, a vinyl ester content of about 12 to about 42 percent by weight, and a melt index of about 5 to about 580.
Claim 3
Dependent Claim
14 words
The composition according to claim 1 wherein the said vinyl ester is vinyl acetate.
Claim 4
Dependent Claim
26 words
The composition according to claim 1 wherein the said copolymer is an ethylene-vinyl acetate copolymer having a molecular weight ranging from about 23,000 to about 27,000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |