US3640691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enhancing low-temperature flow properties of fuel oil
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1968-09-17
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Granted: 1972-02-08
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Expires: 1988-09-17
Abstract
Abstract The response of a middle distillate petroleum fuel oil, boiling within the range of about 250* to about 670* F. at atmospheric pressure and containing normal paraffinic hydrocarbons within the range of about n-decane and n-hexacosane to the addition of a flow-improving additive such as a copolymer of ethylene, is improved by adding to the fuel oil a paraffinic distillate fraction, obtained from a crude petroleum, the said fraction boiling at atmospheric pressure within the range of about 450* to about 950* F. and containing normal paraffins higher than nhexacosane and as high as n-tetracontane, C40H82.
Inventors
- 👤 Stephan Ilnyckyj
- 👤 John Charles O Cole
- 👤 Nicholas Feldman
- 👤 Barney R Strickland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:20
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/143; C10L1/16; C10L1/1616; C10L1/1625; C10L1/1633; C10L1/1641; C10L1/165; C10L1/18; C10L1/192; C10L1/195; C10L1/1955; C10L1/196; C10L1/1963; C10L1/1966; C10L1/197; C10L1/1973; C10L1/22; C10L1/234; C10L1/236; C10L1/2368
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
40 words
A petroleum distillate fuel as defined by claim 1 wherein the resulting blend containing the added distillate fraction contains a spread of at least 16 carbon atoms from the lowest to the highest normal paraffin hydrocarbon present in the blend.
Claim 2
Dependent Claim
21 words
Improved petroleum distillate fuel as defined by claim 1 wherein said copolymer is a copolymer of ethylene and an unsaturated ester.
Claim 3
Dependent Claim
20 words
Improved petroleum distillate fuel as defined by claim 1 wherein said copolymer is a copolymer of ethylene and another olefin.
Claim 4
Dependent Claim
20 words
Improved petroleum distillate fuel as defined by claim 1 wherein said copolymer is a copolymer of ethylene and vinyl acetate.
Claim 5
Dependent Claim
26 words
Improved petroleum distillate fuel as defined by claim 1 wherein said copolymer is a terpolymer of ethylene, vinyl acetate and aliphatic alcohol diester of fumaric acid.
Claim 6
Dependent Claim
25 words
Improved petroleum distillate fuel as defined by claim 1 wherein said paraffin-hydrocarbon-containing distillate fraction is a raffinate obtained by solvent extraction of a petroleum distillate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |