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US3719600A
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Lubricant composition containing polycarboxylic acid
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-02-08
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Granted: 1973-03-06
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Expires: 1991-02-08
Abstract
Abstract This invention is directed towards lubricant compositions comprising a lubricating oil and a corrosion inhibiting amount of a polycarboxylic acid containing at least four non-carboxylic carbon atoms and more than two carboxyl groups. These compositions, when based on synthetic ester oils, exhibit reduced tendencies to corrode metals used in construction of gas turbine engines, particularly, lead.
Inventors
- 👤 D Bosniack
- 👤 H Shaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:59
CPC Classifications
C; C10; C10M; C10M3/00; C10M2203/00; C10M2203/10; C10M2203/102; C10M2203/104; C10M2203/106; C10M2203/108; C10M2205/00; C10M2207/00; C10M2207/04; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/123; C10M2207/129; C10M2207/22; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/287; C10M2207/289; C10M2207/34; C10M2207/40; C10M2207/402; C10M2207/404; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/024; C10M2211/06; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/30; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06; C10M2219/00; C10M2219/10; C10M2219/104; C10M2219/108; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2030/00; C10N2030/08; C10N2040/00; C10N2040/12; C10N2040/13; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
50 words
A lubricant composition comprising: a. a major amount of a lubricating oil; and b. a minor but corrosion inhibiting amount of a polycarboxylic acid of the formula R(COOH)x wherein R is an acyclic hydrocarbyl nucleus having four to 21 carbon atoms, and x is an integer between 3 and 7.
Claim 2
Dependent Claim
50 words
A lubricant composition comprising: a. a major amount of a lubricating oil; and b. a minor but corrosion inhibiting amount of a polycarboxylic acid of the formula R(COOH)x wherein R is an acyclic hydrocarbyl nucleus having four to 21 carbon atoms, and x is an integer between 3 and 7.
Claim 3
Dependent Claim
27 words
A lubricant composition as claimed in claim 1 wherein said acid is of the formula CnH(2n 2 x)(COOH)x wherein n is an integer between 4 and 21.
Claim 4
Dependent Claim
17 words
A lubricant composition as claimed in claim 1 wherein said oil is a synthetic ester lubricating oil.
Claim 5
Dependent Claim
15 words
A lubricant composition as claimed in claim 1 wherein said acid is pentane-1,3,5 tricarboxylic acid.
Claim 6
Dependent Claim
26 words
A lubricant composition as claimed in claim 1 wherein said acid is present in the amount of about 0.01-1.0 part per 100 parts of said oil.
Claim 7
Dependent Claim
27 words
A lubricant composition comprising: a. about 99.9 - 99.98 parts of a synthetic ester lubricating oil, and b. about 0.1 - 0.02 parts of pentane 1,3,5-tricarboxylic acid.
Claim 8
Dependent Claim
27 words
A lubricant composition comprising: a. about 99.9 - 99.98 parts of a synthetic ester lubricating oil, and b. about 0.1 - 0.02 parts of pentane 1,3,5-tricarboxylic acid.
Claim 9
Dependent Claim
61 words
A concentrate for treating lubricant compositions which comprises a. 1 to 100 parts of a lubricating oil, and b. 0.1 to 50 parts of a polycarboxylic acid of the formula R(COOH)x wherein R is an acyclic hydrocarbyl nucleus having four to 21 carbon atoms x is an integer between 3 and 7, and the lubricating oil is present in lubricating amounts.
Claim 10
Dependent Claim
61 words
A concentrate for treating lubricant compositions which comprises a. 1 to 100 parts of a lubricating oil, and b. 0.1 to 50 parts of a polycarboxylic acid of the formula R(COOH)x wherein R is an acyclic hydrocarbyl nucleus having four to 21 carbon atoms x is an integer between 3 and 7, and the lubricating oil is present in lubricating amounts.
Claim 11
Dependent Claim
16 words
A concentrate as claimed in claim 7 wherein the lubricating oil is synthetic ester lubricating oil.
Claim 12
Dependent Claim
16 words
A concentrate as claimed in claim 8 wherein the lubricating oil is present in 99.8 parts.
Claim 13
Dependent Claim
14 words
A concentrate as claimed in claim 7 wherein the acid is pentane 1,3,5-carboxylic acid.
Claim 14
Dependent Claim
57 words
A concentrate for treating lubricant compositions comprising a. about 95.0 - 99.9 parts of a synthetic ester lubricating oil, and b. about 0.1 - 5.0 parts of a polycarboxylic acid of the formula R(COOH)x wherein R is an acyclic hydrocarbyl nucleus having between four and ten carbon atoms and x is an integer between three and six.
Claim 15
Dependent Claim
57 words
A concentrate for treating lubricant compositions comprising a. about 95.0 - 99.9 parts of a synthetic ester lubricating oil, and b. about 0.1 - 5.0 parts of a polycarboxylic acid of the formula R(COOH)x wherein R is an acyclic hydrocarbyl nucleus having between four and ten carbon atoms and x is an integer between three and six.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |