US3947369A
Expired / Lapsed
US
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Lubricating oil base stock
Assignee: Hercules LLC
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Filing: 1972-02-15
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Granted: 1976-03-30
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Expires: 1992-02-15
Abstract
Abstract Disclosed is a synthetic oil useful as a base stock for jet engine lubricating oils. The initial viscosity of the synthetic oil at 210°F. is 5.0-5.5 centistokes and at -40°F. is less than 13,000 centistokes. Furthermore, it does not freeze when held at -40°F. for 72 hours. The oil comprises a blend of (1) a pentaerythritol ester product consisting essentially of pentaerythritol material completely esterified by straight chain C 4 -C 10 alkanoic acid material, and (2) a trimellitate ester product consisting essentially of trimellitic acid completely esterified by C 4 -C 13 alkanol material. The weight ratio of the trimellitate ester product to the pentaerythritol ester product is generally in the range from about 1:10 to about 1:1.
Inventors
- 👤 Raymond Thomas Leibfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:05
CPC Classifications
C; C10; C10M; C10M3/00; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/284; C10M2207/285; C10M2207/286; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/109; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10N; C10N2030/00; C10N2030/08; C10N2040/00; C10N2040/12; C10N2040/13
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A composition of matter useful as a base stock for jet engine lubricating oils or the like, which consists essentially of a blend of (1) a pentaerythritol ester product consisting essentially of pentaerythritol material completely esterified by straight chain C 4 -C 10 alkanoic acid material, and (2) a trimellitate ester product consisting essentially of trimellitic acid completely esterified by C 4 -C 13 alkanol material, the weight ratio of the trimellitate ester product to the pentaerythritol ester product being in the range from about 1:10 to about 1:1.
Claim 2
Dependent Claim
89 words
A composition of matter useful as a base stock for jet engine lubricating oils or the like, which consists essentially of a blend of (1) a pentaerythritol ester product consisting essentially of pentaerythritol material completely esterified by straight chain C 4 -C 10 alkanoic acid material, and (2) a trimellitate ester product consisting essentially of trimellitic acid completely esterified by C 4 -C 13 alkanol material, the weight ratio of the trimellitate ester product to the pentaerythritol ester product being in the range from about 1:10 to about 1:1.
Claim 3
Dependent Claim
29 words
A composition of matter according to claim 1 in which the pentaerythritol material comprises monopentaerythritol at a concentration of at least about 99% by weight of said pentaerythritol material.
Claim 4
Dependent Claim
36 words
A composition according to claim 2 in which the alkanoic acid material consists essentially of normal C 5 -C 9 alkanoic acids and the average carbon atom content of said alkanoic acid material is about six.
Claim 5
Dependent Claim
33 words
A composition according to claim 3 in which the alkanol material consists essentially of normal C 6 -C 10 alkanols and the average carbon atom content of said alkanol material is about eight.
Claim 6
Dependent Claim
14 words
A composition according to claim 4 in which said weight ratio is about 1:3.
Claim 7
Dependent Claim
21 words
A composition according to claim 3 in which the alkanol material consists essentially of normal and branched chain C 7 alkanols.
Claim 8
Dependent Claim
14 words
A composition according to claim 6 in which said weight ratio is about 1:1.9.
Claim 9
Dependent Claim
39 words
A composition according to claim 1 in which the pentaerythritol material comprises monopentaerythritol at a concentration of about 88% by weight of said pentaerythritol material and has a polypentaerythritol content of about 12% by weight of said pentaerythritol material.
Claim 10
Dependent Claim
33 words
A composition according to claim 8 in which the alkanol material consists essentially of normal C 6 -C 10 alkanols and the average carbon atom content of said alkanol material is about eight.
Claim 11
Dependent Claim
83 words
A lubricating oil consisting essentially of (1) a blend of (A) a pentaerythritol ester product consisting essentially of pentaerythritol material completely esterified by straight chain C 4 -C 10 alkanoic acid material, and (B) a trimellitate ester product consisting essentially of trimellitic acid completely esterified by C 4 -C 13 alkanol material, the weight ratio of the trimellitate ester product to the pentaerythritol ester product being in the range from about 1:10 to about 1:1, and (2) a stabilizing quantity of stabilizer material.
Claim 12
Dependent Claim
83 words
A lubricating oil consisting essentially of (1) a blend of (A) a pentaerythritol ester product consisting essentially of pentaerythritol material completely esterified by straight chain C 4 -C 10 alkanoic acid material, and (B) a trimellitate ester product consisting essentially of trimellitic acid completely esterified by C 4 -C 13 alkanol material, the weight ratio of the trimellitate ester product to the pentaerythritol ester product being in the range from about 1:10 to about 1:1, and (2) a stabilizing quantity of stabilizer material.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |