US3868231A
Expired / Lapsed
US
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Fuel composition
Assignee: Shell USA Inc
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Filing: 1972-12-26
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Granted: 1975-02-25
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Expires: 1992-12-26
Abstract
Abstract Fuel compositions having improved low-temperature flow properties comprise wax-containing residual or flashed distillate hydrocarbon fuel having incorporated therein a minor amount of a copolymer of (1) an olefinically unsaturated compound containing an unbranched saturated hydrocarbon chain with at least 14 carbon atoms and (2) a heterocyclic compound which contains an olefinically unsaturated double bond not attached directly to a hetero atom and of which the ring carbon atoms linked to a hetero atom do not carry monovalent hydrocarbon groups, the heterocyclic compound most preferably being 4-vinylpyridine.
Inventors
- 👤 De Kraats Eduard J Van
- 👤 Arnold A Buitelaar
- 👤 Thomas Schreuder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:54
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/146; C10L1/18; C10L1/192; C10L1/195; C10L1/22; C10L1/234; C10L1/236; C10L1/2368; C10L1/24; C10L1/2462; C10L1/2468; C10L1/26; C10L1/2666; C10L1/2675
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
91 words
A RESIDUAL FUEL HAVING IMPROVED LOW-TEMPERATURE PROPERTIES WHEREIN AT LEAST ABOUT 8% BY WEIFHT OF FUEL CONSISTS OF WAXES HAVING A MELTING POINT GREATER THAN ABOUT 35*C AND A BOILING POINT GREATER THAN ABOUT 350*C, SAID FUEL HAVING INCORPORATED THEREIN FROM ABOUT 0.01 TO ABOUT 0.05% BY WEIGHT OF A COPOLYMER OF (1) A C18 TO C26 ALKYL ESTER OF ACRYLIC ACID AND (2) 4-VINYLPYRIDINE, THE COPOLYMER HAVING A NUMBER AVERAGE MOLECULAR WEIGHT BETWEEN 3,000 AND 100,000 AND A MOLAR RATIO OF UNITS FROM (1) TO UNITS FROM (2) OF 2-5:1.
Claim 2
Dependent Claim
91 words
A RESIDUAL FUEL HAVING IMPROVED LOW-TEMPERATURE PROPERTIES WHEREIN AT LEAST ABOUT 8% BY WEIFHT OF FUEL CONSISTS OF WAXES HAVING A MELTING POINT GREATER THAN ABOUT 35*C AND A BOILING POINT GREATER THAN ABOUT 350*C, SAID FUEL HAVING INCORPORATED THEREIN FROM ABOUT 0.01 TO ABOUT 0.05% BY WEIGHT OF A COPOLYMER OF (1) A C18 TO C26 ALKYL ESTER OF ACRYLIC ACID AND (2) 4-VINYLPYRIDINE, THE COPOLYMER HAVING A NUMBER AVERAGE MOLECULAR WEIGHT BETWEEN 3,000 AND 100,000 AND A MOLAR RATIO OF UNITS FROM (1) TO UNITS FROM (2) OF 2-5:1.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein the alkyl of (1) is an average of 21 carbons.
References Cited (Backward Citations)
US2888340A
Cited
US3462249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |