US4320034A
Expired / Lapsed
US
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Electrical capacitor having an improved dielectric system
Assignee: Cooper Industries LLC
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Filing: 1979-10-12
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Granted: 1982-03-16
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Expires: 1999-10-12
Abstract
Abstract An electrical capacitor having an improved dielectric system. The capacitor includes layers of metal foil and a dielectric sheet material which is impregnated with a liquid dielectric composition composed of a mixture of methyl diphenyl ethane and a lower alkyl diphenyl.
Inventors
- 👤 John Lapp
- 👤 Marco J. Mason
- 👤 Gary A. Gauger
- 👤 Hui-Min Chai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:03
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; C; C10; C10M; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/026; C10M2207/04; C10M2207/042; C10M2207/08; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
66 words
An electrical capacitor comprising an outer casing, and a capacitor pack disposed in the casing having alternate layers of metal foil and a dielectric material, said dielectric material being impregnated with a dielectric liquid composition which comprises from about 5% to 95% by weight of a diphenyl ethane with at least one of the phenyl groups having a dimethyl substitution, and the balance being propyl diphenyl.
Claim 2
Dependent Claim
66 words
An electrical capacitor comprising an outer casing, and a capacitor pack disposed in the casing having alternate layers of metal foil and a dielectric material, said dielectric material being impregnated with a dielectric liquid composition which comprises from about 5% to 95% by weight of a diphenyl ethane with at least one of the phenyl groups having a dimethyl substitution, and the balance being propyl diphenyl.
Claim 3
Dependent Claim
22 words
The capacitor of claim 1, wherein said dielectric layer is selected from the group consisting of polymeric film, paper and mixtures thereof.
Claim 4
Dependent Claim
11 words
The capacitor of claim 1, wherein the propyl diphenyl is iso-propyl.
Claim 5
Dependent Claim
12 words
The capacitor of claim 1, wherein the propyl diphenyl is normal propyl.
Claim 6
Dependent Claim
20 words
The capacitor of claim 1, wherein said dielectric liquid includes up to about 10% by weight of an epoxide scavenger.
Claim 7
Dependent Claim
21 words
The capacitor of claim 1, wherein said liquid dielectric composition contains from about 0.01% to 0.20% by weight of an anti-oxidant.
Claim 8
Dependent Claim
25 words
The capacitor of claim 1 wherein said capacitor has a discharge inception voltage greater than 1.7 KV/mil at all temperatures from -40° to +90° C.
Claim 9
Dependent Claim
29 words
The capacitor of claim 1 wherein said dielectric liquid composition in said casing is under a positive pressure in the range of 0.1 to 5.0 psig at room temperature.
Claim 10
Dependent Claim
26 words
The capacitor of claim 1 wherein said dielectric liquid composition in said casing is under a positive pressure at all temperatures from -40° to +90° C.
Claim 11
Dependent Claim
55 words
An electrical capacitor comprising an outer casing, and a capacitor pack disposed in the casing having alternate layers of metal foil and dielectric material, said dielectric material being impregnated with a dielectric liquid composition which comprises from about 5% to 95% by weight of 1,1-bis(3,4-dimethylphenyl) ethane, and 95% to 5% by weight of propyl diphenyl.
Claim 12
Dependent Claim
55 words
An electrical capacitor comprising an outer casing, and a capacitor pack disposed in the casing having alternate layers of metal foil and dielectric material, said dielectric material being impregnated with a dielectric liquid composition which comprises from about 5% to 95% by weight of 1,1-bis(3,4-dimethylphenyl) ethane, and 95% to 5% by weight of propyl diphenyl.
Claim 13
Dependent Claim
12 words
The capacitor of claim 10, wherein the dielectric layers are polymeric film.
Claim 14
Dependent Claim
12 words
The capacitor of claim 10, wherein the propyl diphenyl is iso-propyl diphenyl.
Claim 15
Dependent Claim
24 words
The capacitor of claim 10 wherein said capacitor has a dissipation factor of less than 0.1% at all temperatures from -40° to +90° C.
References Cited (Backward Citations)
JPS4980045A
Cited
JPS49109856A
Cited
JPS5010500A
Cited
JPS5047197A
Cited
JPS5086700A
Cited
US4054937A
Cited
US4054937B1
Cited
DE2934103A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |