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US4435187A
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Fuel and lubricant compositions for octane requirement reduction
Assignee: Shell USA Inc
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Filing: 1981-12-31
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Granted: 1984-03-06
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Expires: 2001-12-31
Abstract
Abstract The reduction of octane requirement in a spark-ignited, internal combustion engine is achieved by introducing, with the combustion intake charge, a fuel and/or lubricant composition containing an octane requirement reduction amount of a substituted urea compound represented by the formula: ##STR1## in which X is an oxygen or sulfur atom, R 1 and R 3 are hydrocarbyl radicals having from 1 to 3 carbon atoms, and R 2 is selected from the group consisting of ##STR2## Particularly useful as ORR agents are: (a) 4-[N-(2,4-xylyl) carbamoyl] morpholine; (b) 1-[N-(2,4-xylyl) carbamoyl] piperidine; and (c) 1-(2-pyridyl)-3-(3,4-xylyl)-2-thiourea.
Inventors
- 👤 L. B. Graiff
- 👤 T. E. Kiovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:49
CPC Classifications
C; C10; C10L; C10L10/00; C10L10/10; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/232; C10L1/24; C10L1/2425; C10L10/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
A fuel composition wherein a major portion of the fuel comprises hydrocarbons boiling in the gasoline range and incorporating a minor amount of an additive composition which exhibits octane requirement reduction properties, said additive composition comprising a substituted urea selected from 4-[N-(2,4-xylyl)carbamoyl] morpholine, 1-[N-(2,4-xylyl)-carbamoyl] piperidine and 1-(2-pyridyl)-3-(2,4-xylyl)-2-thiourea.
Claim 2
Dependent Claim
47 words
A fuel composition wherein a major portion of the fuel comprises hydrocarbons boiling in the gasoline range and incorporating a minor amount of an additive composition which exhibits octane requirement reduction properties, said additive composition comprising a substituted urea selected from 4-[N-(2,4-xylyl)carbamoyl] morpholine, 1-[N-(2,4-xylyl)-carbamoyl] piperidine and 1-(2-pyridyl)-3-(2,4-xylyl)-2-thiourea.
Claim 3
Dependent Claim
12 words
The fuel composition of claim 1 wherein the additive composition is: ##STR12##
Claim 4
Dependent Claim
12 words
The fuel composition of claim 1 wherein the additive composition is: ##STR13##
Claim 5
Dependent Claim
12 words
The fuel composition of claim 1 wherein the additive composition is: ##STR14##
Claim 6
Dependent Claim
30 words
The composition according to claim 2, 3 or 4 wherein said additive is present in the fuel composition in the amount of from about 10 to about 3000 ppm weight.
Claim 7
Dependent Claim
23 words
The composition as in claim 5 wherein the additive is present in an amount of from about 50 to about 1000 ppm weight.
Claim 8
Independent Claim
77 words
A method of operating a spark ignition internal combustion engine which comprises burning in said engine a motor fuel comprising a gasoline boiling range hydrocarbon mixture containing an additive composition comprising a minor amount of substituted urea represented by the formula: ##STR15## in which X is an oxygen or sulfur atom, R 1 and R 2 are hydrocarbyl radicals having from 1 to 3 carbon atoms, and R 3 is selected from the group consisting of ##STR16##
Claim 9
Independent Claim
77 words
A method of operating a spark ignition internal combustion engine which comprises burning in said engine a motor fuel comprising a gasoline boiling range hydrocarbon mixture containing an additive composition comprising a minor amount of substituted urea represented by the formula: ##STR15## in which X is an oxygen or sulfur atom, R 1 and R 2 are hydrocarbyl radicals having from 1 to 3 carbon atoms, and R 3 is selected from the group consisting of ##STR16##
Claim 10
Dependent Claim
11 words
The method of claim 7 wherein the additive composition is: ##STR17##
Claim 11
Dependent Claim
11 words
The method of claim 7 wherein the additive composition is: ##STR18##
Claim 12
Dependent Claim
11 words
The method of claim 7 wherein the additive composition is: ##STR19##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |