Patent FR569764A successfully refreshed from Google Patents.
Patent US4045376A successfully refreshed from Google Patents.
US4045376A
Expired / Lapsed
US
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Synthetic turbine oils
Assignee: Texaco Inc
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Filing: 1976-04-23
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Granted: 1977-08-30
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Expires: 1996-04-23
Abstract
Abstract Disclosed are synthetic lubricating oil compositions for turbine engines containing a major amount of aliphatic carboxylic acid esters having lubricating properties whose pour points are depressed by the incorporation of a synergistic mixture of minor amounts of at least one mineral oil with a methacrylic pour point depressant.
Inventors
- 👤 Isaac D. Rubin
- 👤 John W. Nebzydoski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:39
CPC Classifications
C; C10; C10M; C10M169/00; C10M169/04; C10M169/047; C10M105/00; C10M105/08; C10M105/32; C10M105/36; C10M105/38; C10M145/00; C10M145/18; C10M159/00; C10M159/02; C10M159/04; C10M2203/00; C10M2203/10; C10M2203/102; C10M2203/104; C10M2203/106; C10M2203/108; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/2825; C10M2207/283; C10M2207/2835; C10M2207/285; C10M2207/2855; C10M2207/286; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/109; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/028; C10M2217/06; C10N; C10N2040/00; C10N2040/135
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A synthetic lubricating oil composition comprising a major amount of an aliphatic ester base oil having lubricating properties and formed by the reaction of a pentaerythritol or trimethylolpropane and an organic acid having from about 2 to about 12 carbon atoms per molecule together with a pour point depressant amount of a mixture of a mineral oil having lubricating properties and a pour point ranging from -40° F to +35° F with a copolymer of two or more esters of methacrylic acid characterized by the formula: ##STR2## wherein R is a radical ranging from butyl to stearyl and n is an integer giving a molecular weight to said polymer ranging from 5000 to 500,000.
Claim 2
Dependent Claim
114 words
A synthetic lubricating oil composition comprising a major amount of an aliphatic ester base oil having lubricating properties and formed by the reaction of a pentaerythritol or trimethylolpropane and an organic acid having from about 2 to about 12 carbon atoms per molecule together with a pour point depressant amount of a mixture of a mineral oil having lubricating properties and a pour point ranging from -40° F to +35° F with a copolymer of two or more esters of methacrylic acid characterized by the formula: ##STR2## wherein R is a radical ranging from butyl to stearyl and n is an integer giving a molecular weight to said polymer ranging from 5000 to 500,000.
Claim 3
Dependent Claim
18 words
The composition of claim 1 containing from about 2 to 35 percent by weight of said mineral oil.
Claim 4
Dependent Claim
17 words
The composition of claim 1 containing from about 0.01 to 5.0 percent by weight of said polymer.
Claim 5
Dependent Claim
15 words
The composition of claim 1 wherein said ester is the dipentaerythritol ester of nonanoic acid.
Claim 6
Dependent Claim
15 words
The composition of claim 1 wherein said ester is the pentaerythritol ester of nonanoic acid.
Claim 7
Dependent Claim
15 words
The composition of claim 1 wherein said ester is the pentaerythritol ester of octanoic acid.
Claim 8
Dependent Claim
22 words
The composition of claim 1, wherein R in the above formula comprises 20 percent lauryl, 40 percent octyl and 40 percent cetyl.
Claim 9
Dependent Claim
18 words
The composition of claim 1, wherein R in said formula comprises 50 percent lauryl and 50 percent stearyl.
Claim 10
Dependent Claim
18 words
The composition of claim 1, wherein R in said formula comprises 50 percent lauryl and 50 percent octyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |