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US5108462A
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Smoke reducing additive for two-cycle engine lubricant-fuel mixture
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1990-12-27
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Granted: 1992-04-28
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Expires: 2010-12-27
Abstract
Abstract A lubricant-fuel mixture containing an amine salt and/or amide of a thiobenzoic acid derivative is effective in reducing the smoke emitted during operation of a two-cycle internal combustion engine. A preferred thiobenzoic acid derivative is 4-hydroxy-3,5-ditert-dibutyldithiobenzoate.
Inventors
- 👤 Jacob J. Habeeb
- 👤 Christopher J. May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:20
CPC Classifications
C; C10; C10M; C10M135/00; C10M135/12; C10M135/14; C10M135/18; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/24; C10L1/2425; C10L10/00; C10L10/02; C10M133/00; C10M133/02; C10M133/04; C10M133/06; C10M133/16; C10L1/18; C10L1/182; C10L1/183; C10L1/1832; C10L1/188; C10L1/1881; C10L1/1883; C10L1/189; C10L1/20; C10L1/201; C10L1/22; C10L1/222; C10L1/224; C10L1/30; C10L1/305; C10L1/306; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/044; C10M2215/08; C10M2215/082; C10M2215/24; C10M2215/26; C10M2215/28; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/066; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/047; C10N; C10N2040/00; C10N2040/25; C10N2040/251; C10N2040/255; C10N2040/26; C10N2040/28; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
117 words
A lubricating oil-fuel mixture comprising (a) a lubricating oil basestock, (b) a distillate fuel, and (c) an oil-soluble additive comprised of a hydrocarbyl substituted amine salt or amide of a compound having the formula: ##STR3## wherein X is oxygen or sulfur, and R 1 , R 2 , R 3 , R 4 and R 5 are selected from hydrogen; a hydrocarbyl group containing from 1 to 24 carbon atoms; a hydroxy group, and an oxygen-containing hydrocarbyl group containing from 1 to 24 carbon atoms and at least one of the radicals R 1 , R 2 , R 3 , R 4 or R 5 is a hydrocarbyl group containing from 1 to 24 carbon atoms.
Claim 2
Dependent Claim
117 words
A lubricating oil-fuel mixture comprising (a) a lubricating oil basestock, (b) a distillate fuel, and (c) an oil-soluble additive comprised of a hydrocarbyl substituted amine salt or amide of a compound having the formula: ##STR3## wherein X is oxygen or sulfur, and R 1 , R 2 , R 3 , R 4 and R 5 are selected from hydrogen; a hydrocarbyl group containing from 1 to 24 carbon atoms; a hydroxy group, and an oxygen-containing hydrocarbyl group containing from 1 to 24 carbon atoms and at least one of the radicals R 1 , R 2 , R 3 , R 4 or R 5 is a hydrocarbyl group containing from 1 to 24 carbon atoms.
Claim 3
Dependent Claim
33 words
The mixture of claim 1 wherein the hydrocarbyl substituted amine used in the preparation of the oil-soluble additive comprises at least one straight chain alkyl group containing from 8 to 40 carbon atoms.
Claim 4
Dependent Claim
13 words
The mixture of claim 2 wherein the oil-soluble additive is an amine salt.
Claim 5
Dependent Claim
37 words
The mixture of claim 3 wherein at least one of the radicals R 1 , R 2 , R 3 , R 4 or R 5 is a hydrocarbyl radical containing from 1 to 18 carbon atoms.
Claim 6
Dependent Claim
17 words
The mixture of claim 4 wherein X in the formula for the benzoic acid derivative represents sulfur.
Claim 7
Dependent Claim
37 words
The mixture of claim 5 wherein at least one of the radicals R 1 , R 2 , R 3 , R 4 or R 5 is an alkyl group containing from 1 to 6 carbon atoms.
Claim 8
Dependent Claim
30 words
The mixture of claim 6 wherein at least one of the radicals R 1 , R 2 , R 3 , R 4 or R 5 is a hydroxy group.
Claim 9
Dependent Claim
25 words
The mixture of claim 7 wherein the hydrocarbyl substituted amine comprises at least one straight chain alkyl group containing from 12 to 24 carbon atoms.
Claim 10
Dependent Claim
14 words
The mixture of claim 8 wherein the hydrocarbyl substituted amine is a tallow amine.
Claim 11
Dependent Claim
18 words
The mixture of claim 9 wherein the oil-soluble additive is a ditallow amine salt of 4-hydroxy-3, 5-di-tert-butyldithiobenzoic acid.
Claim 12
Dependent Claim
20 words
The mixture of claim 1 wherein from about 0.1 to about 5 wt.% of the oil-soluble additive is present therein.
Claim 13
Dependent Claim
20 words
The mixture of claim 11 wherein the volume ratio of lubricant to fuel ranges from about 20 to about 1:250.
Claim 14
Dependent Claim
9 words
The mixture of claim 12 wherein fuel is gasoline.
Claim 15
Dependent Claim
23 words
A method for reducing the smoke emitted from a two-cycle internal combustion engine by operating the engine with the mixture of claim 1.
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) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |