US4119551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic aircraft turbine lubricating oil compositions
Assignee: Afton Chemical Additives Corp
•
Filing: 1977-06-28
•
Granted: 1978-10-10
•
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 a bis (dialkylthiocarbamyl) sulfide.
Inventors
- 👤 Roberta Yaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:50
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; C10M135/12; C10M135/14; C10M135/18; 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; C10M2219/06; C10M2219/062; C10M2219/066; C10M2219/068; 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: 10
Claim 1
Independent Claim
187 words
A synthetic lubricating oil composition for a gas turbine engine comprising 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 containing: (a) 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, (b) from about 0.3 to 5 percent by weight of a dialkyldiphenylamine in which the alkyl radicals have from 4 to 12 carbon atoms, (c) from about 0.001 to 1 percent by weight of a polyhydroxy-substituted anthraquinone, (d) from about 0.25 to 10 percent by weight of a hydrocarbyl phosphate ester in which said hydrocarbyl radical contains an aryl ring and contains from about 6 to 18 carbon atoms, and (e) from about 0.05 to about 0.1 percent by weight of bis(dialkylthiocarbamyl) sulfide containing from 1 to 6 carbon atoms in each alkyl group, linear or branched.
Claim 2
Dependent Claim
187 words
A synthetic lubricating oil composition for a gas turbine engine comprising 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 containing: (a) 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, (b) from about 0.3 to 5 percent by weight of a dialkyldiphenylamine in which the alkyl radicals have from 4 to 12 carbon atoms, (c) from about 0.001 to 1 percent by weight of a polyhydroxy-substituted anthraquinone, (d) from about 0.25 to 10 percent by weight of a hydrocarbyl phosphate ester in which said hydrocarbyl radical contains an aryl ring and contains from about 6 to 18 carbon atoms, and (e) from about 0.05 to about 0.1 percent by weight of bis(dialkylthiocarbamyl) sulfide containing from 1 to 6 carbon atoms in each alkyl group, linear or branched.
Claim 3
Dependent Claim
35 words
A lubricating oil composition as claimed in claim 1 wherein said bis(dialkylthiocarbamyl) sulfide contains from 1 to 4 carbon atoms in each alkyl group and wherein each alkyl group may be the same or different.
Claim 4
Dependent Claim
14 words
A lubricating oil composition as claimed in claim 1 wherein the naphthylamine is octylphenyl-alpha-or-beta-naphthylamine.
Claim 5
Dependent Claim
21 words
A lubricating oil composition as claimed in claim 1 containing from about 0.5 to 2.0 percent by weight of a dialkyldiphenylamine.
Claim 6
Dependent Claim
15 words
A lubricating oil composition as claimed in claim 4, wherein the dialkyldiphenylamine is a dioctyldiphenylamine.
Claim 7
Dependent Claim
22 words
A lubricating oil composition as claimed in claim 1 containing from about 0.01 to 0.5 percent by weight of said polydroxy-substituted anthraquinone.
Claim 8
Dependent Claim
16 words
A lubricating oil composition as claimed in claim 6 wherein the polyhydroxy-substituted anthraquinone is 1,4 dihydroxyanthraquinone.
Claim 9
Dependent Claim
23 words
A lubricating oil composition as claimed in claim 1 containing from about 0.5 to 5 percent by weight of a hydrocarbyl phosphate ester.
Claim 10
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 by weight of the composition.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |