US3925221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized ester impregant
Assignee: General Electric Co
•
Filing: 1973-06-12
•
Granted: 1975-12-09
•
Expires: 1993-06-12
Abstract
Abstract A dielectric liquid composition for electrical applications comprises a liquid aromatic ester which has been stabilized with about 0.01% to 10.0% by weight of an epoxide dissolved therein.
Inventors
- 👤 John W Eustance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:34
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; H01B; H01B3/00; H01B3/18; H01B3/20; C; C10; C10M; C10M2203/00; C10M2203/06; C10M2205/00; C10M2205/02; C10M2205/026; C10M2207/00; C10M2207/04; C10M2207/042; C10M2207/28; C10M2207/282; C10M2207/284; C10M2207/285; C10M2207/287; C10M2207/289; C10M2207/34; C10M2207/40; C10M2207/402; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
39 words
DIELECTRIC LIQUID COMPOSITION WITH A POWER FACTOR OF LESS THAN 5% MEASURED AT 100*C. AND 100 HZ FOR USE IN ELECTRICAL CAPACITORS, AND HAVING AS A PRINCIPAL CONSTITUENT AS ESTER OF PHTHALIC ACID AND AN ALCOHOL HAVING THE FORMULA
Claim 2
Dependent Claim
39 words
DIELECTRIC LIQUID COMPOSITION WITH A POWER FACTOR OF LESS THAN 5% MEASURED AT 100*C. AND 100 HZ FOR USE IN ELECTRICAL CAPACITORS, AND HAVING AS A PRINCIPAL CONSTITUENT AS ESTER OF PHTHALIC ACID AND AN ALCOHOL HAVING THE FORMULA
Claim 3
Dependent Claim
18 words
The invention of claim 1 wherein said aromatic ester is an ester of phthalic acid and an alcohol.
Claim 4
Dependent Claim
15 words
The invention of claim 2 wherein said phthalate ester is an ester of 2-ethylhexyl alcohol.
Claim 5
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is dimethyl phthalate.
Claim 6
Dependent Claim
13 words
The iNvention as recited in claim 1 wherein said ester is diethyl phthalate.
Claim 7
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is dipropyl phthalate.
Claim 8
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is dibutyl phthalate.
Claim 9
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is diamyl phthalate.
Claim 10
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is dihexyl phthalate.
Claim 11
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is diheptyl phathalate.
Claim 12
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is dioctyl phthalate.
Claim 13
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is dinonyl phthalate.
Claim 14
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is didecyl phthalate.
Claim 15
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is dicapryl phthalate.
Claim 16
Dependent Claim
19 words
The invention as recited in claim 1 wherein said ester is an ester of benzoic acid and an alcohol.
Claim 17
Dependent Claim
21 words
the invention as recited in claim 1 wherein said ester is an ester of an aromatic alcohol and a phosphoric acid.
Claim 18
Dependent Claim
13 words
The invention as recited in claim 1 wherein said ester is tricresyl phosphate.
Claim 19
Dependent Claim
17 words
The invention as recited in claim 1 wherein said epoxide stabilizer is a derivative of ethylene oxide.
Claim 20
Dependent Claim
17 words
The invention as recited in claim 1 wherein said epoxide stabilizer is a derivative of glycidyl ether.
Claim 21
Dependent Claim
17 words
The invention as recited in claim 1 wherein said epoxide stabilizer is diglycidyl ether of bisphenol A.
Claim 22
Dependent Claim
32 words
The invention as recited in claim 1 wherein liquid composition comprises said ester in a mixture, with the said ester being effective in the mixture as an impregnant in said liquid apparatus.
Claim 23
Dependent Claim
15 words
The invention as recited in claim 2 wherein said mixture is a mixture of esters.
Claim 24
Dependent Claim
15 words
The invention as recited in claim 2 wherein said mixture consists essentially of aromatic esters.
Claim 25
Dependent Claim
16 words
The invention as recited in claim 21 wherein said mixture includes said ester and a hydrocarbon.
Claim 26
Dependent Claim
14 words
The invention as recited in claim 21 wherein said hydrocarbon is an alkyl benzene.
Claim 27
Dependent Claim
41 words
Dielectric liquid impregnant for use in electrical apparatus comprising a liquid aromatic phthalic acid ester of a branched chain alcohol to which has been added a derivative of glycidyl ether of between about 0.01 to 10.0% by weight as a stabilizer.
Claim 28
Dependent Claim
41 words
Dielectric liquid impregnant for use in electrical apparatus comprising a liquid aromatic phthalic acid ester of a branched chain alcohol to which has been added a derivative of glycidyl ether of between about 0.01 to 10.0% by weight as a stabilizer.
Claim 29
Dependent Claim
13 words
The invention as recited in claim 26 wherein said ester is dioctyl phthalate.
Claim 30
Dependent Claim
17 words
The invention as recited in claim 27 wherein said epoxide is a diglycidyl ether of bisphenol A.
Claim 31
Dependent Claim
16 words
The invention as recited in claim 2 wherein said phthalate ester is a branched chain ester.
References Cited (Backward Citations)
US1895376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |