US3894959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed carboxylic acid esters as electrical insulating oils
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1972-10-17
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Granted: 1975-07-15
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Expires: 1992-10-17
Abstract
Abstract Esters made from C3 to C6 polyols having 2 to 4 hydroxyl groups and mixtures of monocarboxylic acids containing up to 50 mole % C7 to C14 aromatic acids and at least 50 mole % C4 to C14 aliphatic acid, and esters made from said acid mixtures and C8 to C40 polyol ethers containing at least 2 hydroxyl groups and at least 1 ether group are useful as insulating oils in electrical equipment.
Inventors
- 👤 J Brooke Gardiner
- 👤 Harold Shaub
- 👤 Keith C Tessier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:54
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
AN ELECTRICAL INSULATING OIL COMPRISING A FULLY ESTERIFIED ESTER OF: A. A MIXTURE OF ABOUT 1 TO 50 MOLE % OF A C7 TO C14 AROMATIC MONOCARBOXYLIC ACID AND ABOUT 99 TO 50 MOLE % OF A C4 TO C14 ALIPHATIC MONOCARBOXYLIC ACID, AND B. A POLYHYDRIC ALCOHOL SEECTED FROM THE GROUP CONSISTING OF C3 TO C6 POLYOL OF FROM 3 TO 6 CARBON ATOMS AND HAVING 2 TO 4 HYDROXYL GROUPS, AND A POLYOL ETHER OF FROM 8 TO 40 CARBON ATOMS AND HAVING 2 TO 12 HYDROXYL GROUPS AND 1 TO 5 ETHER GROUPS.
Claim 2
Dependent Claim
96 words
AN ELECTRICAL INSULATING OIL COMPRISING A FULLY ESTERIFIED ESTER OF: A. A MIXTURE OF ABOUT 1 TO 50 MOLE % OF A C7 TO C14 AROMATIC MONOCARBOXYLIC ACID AND ABOUT 99 TO 50 MOLE % OF A C4 TO C14 ALIPHATIC MONOCARBOXYLIC ACID, AND B. A POLYHYDRIC ALCOHOL SEECTED FROM THE GROUP CONSISTING OF C3 TO C6 POLYOL OF FROM 3 TO 6 CARBON ATOMS AND HAVING 2 TO 4 HYDROXYL GROUPS, AND A POLYOL ETHER OF FROM 8 TO 40 CARBON ATOMS AND HAVING 2 TO 12 HYDROXYL GROUPS AND 1 TO 5 ETHER GROUPS.
Claim 3
Dependent Claim
15 words
An electrical insulating oil as defined by claim 1 which comprises an ester of pentaerythritol.
Claim 4
Dependent Claim
15 words
An electrical insulating oil as defined by claim 1 which comprises an ester of polypentaerythritol.
Claim 5
Dependent Claim
17 words
An electrical insulating oil as defined by claim 3 wherein said ester is an ester of dipentaerythritol.
Claim 6
Dependent Claim
17 words
An electrical insulating oil as defined by claim 1 wherein said mixture of acids includes benzoic acid.
Claim 7
Dependent Claim
20 words
An electrical insulating oil as defined by claim 1 wherein said acid mixture includes a mixture of aliphatic monocarboxylic acids.
Claim 8
Dependent Claim
25 words
A method for improving the operation of an electrical device which comprises using as an electrical insulating oil therefOr an ester defined by claim 1.
Claim 9
Dependent Claim
14 words
An electrical device containing as a dielectric medium the ester defined by claim 1.
Claim 10
Dependent Claim
39 words
An electrical insulating oil as defined by claim 1 wherein the mole percent of aromatic monocarboxylic acid in said mixture of aromatic monocarboxylic acids and aliphatic monocarboxylic acids is within the range of about 1 to 30 mole %.
Claim 11
Dependent Claim
22 words
An electrical insulating oil as defined by claim 1 wherein said ester is of a mixture of polyhydric alcohol and polyol ether.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |