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US3912640A
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Gas turbine lubricants
Assignee: Akzo America Inc
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Filing: 1972-08-07
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Granted: 1975-10-14
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Expires: 1992-08-07
Abstract
Abstract A gas turbine lubricant having excellent high temperature stability and additive compatibility can be formulated by employing, as a base stock, a blend of a carboxylate ester, and a low viscosity mineral oil.
Inventors
- 👤 Sr Joseph F Anzenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:23
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2203/00; C10M2203/10; C10M2203/102; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/028; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2207/026; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/123; C10M2207/129; C10M2207/22; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/109; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/14; C10M2215/22; C10M2215/221; C10M2215/222; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10M2219/00; C10M2219/10; C10M2219/104; C10M2219/108; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/043; C10M2223/06; C10M2223/065; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/041; C10M2229/05; C10N; C10N2030/00; C10N2030/08; C10N2040/00; C10N2040/12; C10N2040/13
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
37 words
A BASE STOCK SUITABLE FOR USE IN GAS TUBINE LUBRICANTS CONSISTING ESSENTIALLY OF: A. FROM ABOUT 20 TO ABOUT 80% BY WEIGHT OF THE BASE STOCK OF A COMBINATION OF (I) AN ISOPHTHALATE ESTER HAVING THE FORMULA:
Claim 2
Dependent Claim
37 words
A BASE STOCK SUITABLE FOR USE IN GAS TUBINE LUBRICANTS CONSISTING ESSENTIALLY OF: A. FROM ABOUT 20 TO ABOUT 80% BY WEIGHT OF THE BASE STOCK OF A COMBINATION OF (I) AN ISOPHTHALATE ESTER HAVING THE FORMULA:
Claim 3
Dependent Claim
41 words
The base stock of claim 1 wherein said isophthalate ester is present in an amount from about 50 to about 80% and said oil is present in an amount from about 50 to about 20% by weight of the base stock.
Claim 4
Dependent Claim
16 words
The base stock of claim 1 wherein R1 and R2 are each a C6-C12 alkyl group.
Claim 5
Dependent Claim
27 words
The base stock of claim 3 wherein said adipate diester is derived from the esterification of adipic acid and an 80:20 molar mixture of isooctanol and isodecanol.
Claim 6
Dependent Claim
13 words
The base stock of claim 1 wherein said adipate diester is di-2-ethylhexyl adipate.
Claim 7
Dependent Claim
41 words
The base stock of claim 1 wherein said isophthalate ester is selected from the group consisting of di-2-ethylhexyl isophthalate, diisooctyl isophthalate, isooctyl isodecyl isophthalate, 2-ethylhexyl isodecyl isophthalate, diisodecyl isophthalate, and the ester of isophthalic and mixtures of C6-C12 straight chained alkanols.
Claim 8
Dependent Claim
13 words
The base stock of claim 6 wherein the isophthalate ester is di-2-ethylhexyl iSophthalate.
Claim 9
Dependent Claim
25 words
The base stock of claim 1 wherein said mineral oil has a viscosity in the range from about 5 to about 6.5 at 210* F.
Claim 10
Dependent Claim
25 words
A gas turbine lubricant comprising the base stock of claim 1 and up to 5% by weight of the lubricant of a viscosity index improver.
Claim 11
Dependent Claim
34 words
A gas turbine lubricant consisting essentially of the base stock of claim 1 and an oxidation inhibiting amount of a combination of (a) phenothiazine or derivative of phenothiazine and (b) a secondary diaryl amine.
Claim 12
Dependent Claim
24 words
The gas turbine lubricant of claim 10 wherein said derivative of phenothiazine is N-ethyl dioctyl phenothiazine and said diaryl amine is p,p''-dioctyl diphenyl amine.
Claim 13
Dependent Claim
19 words
The gas turbine lubricant of claim 10, which additionally contains an oxidation inhibiting amount of a methylene-linked hindered bisphenol.
Claim 14
Dependent Claim
16 words
The gas turbine lubricant of claim 12 wherein said methylene-linked hindered bisphenol is 4,4''-methylene bis(2,6-di-t-butyl phenol).
Claim 15
Dependent Claim
24 words
The base stock of claim 6 wherein said isophthalate ester is derived from isophthalic acid and a mixture of C6- C10 straight chained alkanols.
Claim 16
Dependent Claim
24 words
The base stock of claim 6 wherein said isophthalate ester is derived from isophthalic acid and a mixture of C11- C12 straight chained alkanols.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |