US3765849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow improvers for hydrocarbon oils and method of preparing same
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-07-07
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Granted: 1973-10-16
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Expires: 1991-07-07
Abstract
Abstract Copolymers of vinyl ester and an ester of a dialkyl unsaturated dicarboxylic acid prepared by partial transesterification of a short chain alcohol ester of said dicarboxylic acid with a C20 to C30 alcohol are flow improvers in residual and crude oils.
Inventors
- 👤 S Ilnyckyj
- 👤 T Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:52
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/192; C10L1/195; C10L1/197; C10L1/1973
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
A composition according to claim 1, wherein said vinyl ester is vinyl acetate, said dicarboxylic acid in fumaric acid, said long chain alcohol is behenyl alcohol, said C1 to C5 alcohol is methanol, and about 75 mole percent of said dialkyl groups of said dialkyl ester are the alkyl groups from behenyl alcohol and about 25 mole percent of said dialkyl groups are the alkyl groups from methanol.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |