US4320018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic aircraft turbine oil
Assignee: Afton Chemical Additives Corp
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Filing: 1979-10-19
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Granted: 1982-03-16
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Expires: 1999-10-19
Abstract
Abstract Synthetic lubricating oil composition having improved oxidation stability comprising a major portion of an aliphatic ester base oil having lubricating properties, formed by the reaction of pentaerythritol and an organic monocarboxylic acid and containing a phenylnaphthylamine, a dialkyldiphenylamine, a polyhydroxy anthraquinone, a hydrocarbyl phosphate ester and a dialkyldisulfide.
Inventors
- 👤 Roberta Yaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:21
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; C10M135/20; C10M135/22; 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; C10M2219/08; C10M2219/082; C10M2219/083; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
A synthetic lubricating oil composition consisting of a major portion of an aliphatic ester base oil having lubricating properties formed from the reaction of pentaerythritol or a polypentaerythritol or trimethylolpropane and an organic monocarboxylic acid having from about 2 to 18 carbon atoms per molecule and: (a) from about 0.3 to 5 percent by weight of the lubricating oil composition of a phenylnaphthylamine or an alkyl or alkaryl phenyl naphthylamine in which the alkyl radical has from 4 to 12 carbon atoms, (b) from about 0.3 to 5 percent by weight of a dialkyldiphenylamine in which the alkyl radical has from 4 to 12 carbon atoms, (c) from about 0.01 to 0.5 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 0.01 to about 0.5 percent by of a dialkyldisulfide containing from 4 to 20 carbon atoms in each alkyl group.
Claim 2
Dependent Claim
175 words
A synthetic lubricating oil composition consisting of a major portion of an aliphatic ester base oil having lubricating properties formed from the reaction of pentaerythritol or a polypentaerythritol or trimethylolpropane and an organic monocarboxylic acid having from about 2 to 18 carbon atoms per molecule and: (a) from about 0.3 to 5 percent by weight of the lubricating oil composition of a phenylnaphthylamine or an alkyl or alkaryl phenyl naphthylamine in which the alkyl radical has from 4 to 12 carbon atoms, (b) from about 0.3 to 5 percent by weight of a dialkyldiphenylamine in which the alkyl radical has from 4 to 12 carbon atoms, (c) from about 0.01 to 0.5 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 0.01 to about 0.5 percent by of a dialkyldisulfide containing from 4 to 20 carbon atoms in each alkyl group.
Claim 3
Dependent Claim
22 words
A lubricating oil composition as claimed in claim 1 containing from about 0.1 to about 0.5 percent by weight of said dialkyldisulfide.
Claim 4
Dependent Claim
24 words
A lubricating oil composition as claimed in claim 1 wherein the naphthylamine is present in an amount of 0.5 to 2.5 percent by weight.
Claim 5
Dependent Claim
14 words
A lubricating oil composition as claimed in claim 1 wherein the dialkyldisulfide if di-t-octyldisulfide.
Claim 6
Dependent Claim
14 words
A lubricating oil composition as claimed in claim 1 wherein the naphthylamine is octylphenyl-alpha-or-beta-naphthylamine.
Claim 7
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 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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |