US4141844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic aircraft turbine oil
Assignee: Afton Chemical Additives Corp
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Filing: 1977-06-28
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Granted: 1979-02-27
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Expires: 1997-06-28
Abstract
Abstract Synthetic lubricating oil composition having improved oxidation stability comprising a major portion of an aliphatic ester base oil having lubricating properties formed from the reaction of pentaerythritol and an organic monocarboxylic acid, and containing an alkylphenyl or alkarylphenyl naphthylamine, a dialkyldiphenylamine, a polyhydroxy anthraquinone, a hydrocarbyl phosphate ester and an S-alkyl-2-mercaptobenzimidazole.
Inventors
- 👤 Roberta Yaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:29
CPC Classifications
C; C10; C10M; C10M169/00; C10M169/04; C10M105/00; C10M105/08; C10M105/32; C10M105/38; C10M129/00; C10M129/02; C10M129/04; C10M129/10; C10M129/14; C10M133/00; C10M133/02; C10M133/04; C10M133/12; C10M135/00; C10M135/32; C10M137/00; C10M137/02; C10M137/04; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2207/025; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/2835; C10M2207/286; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/066; C10M2215/067; C10M2215/068; C10M2219/00; C10M2219/09; C10M2219/10; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10N; C10N2030/00; C10N2030/08; C10N2040/00; C10N2040/12; C10N2040/13; C10N2040/135
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
181 words
A synthetic lubricating oil composition for a gas turbine engine consisting of a major portion of an aliphatic ester base oil having lubricating properties formed from the reaction of pentaerythritol and an organic monocarboxylic acid having from about 2 to 18 carbon atoms per molecule and: from about 0.3 to 5 percent by weight of the lubricating oil composition of an alkyl or alkaryl phenyl naphthylamine in which the alkyl radical has from 4 to 12 carbon atoms and the alkaryl radical has from 7 to 12 carbon atoms, from about 0.3 to 5 percent by weight of a dialkyldiphenylamine in which the alkyl radicals have from 4 to 12 carbon atoms, from about 0.001 to 1 percent by weight of a polyhydroxy-substituted anthraquinone, from about 0.25 to 10 percent by weight of a hydrocarbyl phosphate in which said hydrocarbyl radical contains an aryl ring and contains from about 6 to 18 carbon atoms, and from about 0.005 to 0.1 percent by weight of an S-alkyl-2-mercaptobenzimidazole containing from 1 to about 20 carbon atoms in the alkyl portion, linear or branched.
Claim 2
Dependent Claim
181 words
A synthetic lubricating oil composition for a gas turbine engine consisting of a major portion of an aliphatic ester base oil having lubricating properties formed from the reaction of pentaerythritol and an organic monocarboxylic acid having from about 2 to 18 carbon atoms per molecule and: from about 0.3 to 5 percent by weight of the lubricating oil composition of an alkyl or alkaryl phenyl naphthylamine in which the alkyl radical has from 4 to 12 carbon atoms and the alkaryl radical has from 7 to 12 carbon atoms, from about 0.3 to 5 percent by weight of a dialkyldiphenylamine in which the alkyl radicals have from 4 to 12 carbon atoms, from about 0.001 to 1 percent by weight of a polyhydroxy-substituted anthraquinone, from about 0.25 to 10 percent by weight of a hydrocarbyl phosphate in which said hydrocarbyl radical contains an aryl ring and contains from about 6 to 18 carbon atoms, and from about 0.005 to 0.1 percent by weight of an S-alkyl-2-mercaptobenzimidazole containing from 1 to about 20 carbon atoms in the alkyl portion, linear or branched.
Claim 3
Dependent Claim
15 words
A lubricating oil composition as claimed in claim 1 containing about 0.05% of said S-alkyl-2-mercaptobenzimidazole.
Claim 4
Dependent Claim
20 words
A lubricating oil composition as claimed in claim 1 containing from about 0.025 to 0.075 percent of S-hexyl-2-mercaptobenzimidazole, by weight.
Claim 5
Dependent Claim
16 words
A lubricating oil composition as claimed in claim 1 wherein the naphthylamine is octylphenyl-alpha of beta-naphthylamine.
Claim 6
Dependent Claim
21 words
A lubricating oil composition as claimed in claim 1 containing from about 0.5 to 2.0 percent of a dialkyldiphenylamine, by weight.
Claim 7
Dependent Claim
15 words
A lubricating oil composition as claimed in claim 5, wherein the dialkyldiphenylamine is a dioctyldiphenylamine.
Claim 8
Dependent Claim
22 words
A lubricating oil composition as claimed in claim 1 containing from about 0.01 to 0.5 percent of said polyhydroxy-substituted anthraquinone, by weight.
Claim 9
Dependent Claim
15 words
A lubricating oil composition as claimed in claim 7 wherein the polyhydroxy-substituted anthraquinone is 1,4-dihydroxyanthraquinone.
Claim 10
Dependent Claim
23 words
A lubricating oil composition as claimed in claim 1 containing from about 0.5 to 5 percent of a hydrocarbyl phosphate ester, by weight.
Claim 11
Dependent Claim
32 words
A lubricating oil composition as claimed in claim 1 wherein the aliphatic ester base oil is present in a concentration of from about 90 to 98 percent of the composition, by weight.
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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |