Patent US4538208A successfully refreshed from Google Patents.
US4538208A
Expired / Lapsed
US
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Alternating current capacitor
Assignee: Emhart Industries Inc
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Filing: 1984-05-21
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Granted: 1985-08-27
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Expires: 2004-05-21
Abstract
Abstract A method is provided for gelling a dielectric in an alternating current capacitor of the type having a housing enclosing a pair of convolutely wound electrodes and dielectric spacers interleaved therebetween for separating the electrode with at least one of the electrodes being formed by a metallized film and using a dielectric of soybean oil, the method comprising adding an alkylhydroxyphenlalkanolyhydrazine compound to the soybean oil to gel the same within the housing so as to reduce its mobility and maintain the dielectric in proximity to the electrodes for reducing electrical corona discharge between the electrodes and for reducing electrical erosion of the electrodes.
Inventors
- 👤 Vandos Shedigian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:59
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
In an alternating current capacitor of the type having a housing enclosing a pair of convolutely wound electrodes, a dielectric including soybean oil and dielectric spacer means interleaved therebetween for separating said electrodes, with at least one of said electrodes being formed by a metallized film, a method of reducing the mobility of said dielectric and maintaining same in proximity to said electrodes which comprises adding a minor amount of an alkylhydroxyphenylalkanolyhydrazine compound to provide a gel of said soybean oil within said housing.
Claim 2
Dependent Claim
84 words
In an alternating current capacitor of the type having a housing enclosing a pair of convolutely wound electrodes, a dielectric including soybean oil and dielectric spacer means interleaved therebetween for separating said electrodes, with at least one of said electrodes being formed by a metallized film, a method of reducing the mobility of said dielectric and maintaining same in proximity to said electrodes which comprises adding a minor amount of an alkylhydroxyphenylalkanolyhydrazine compound to provide a gel of said soybean oil within said housing.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said additive is N, N'-bis3-(3',5'-di-tert-butyl-4'-hydroxyphenyl) propionyl hydrazine.
Claim 4
Dependent Claim
28 words
The improvement of claim 2 wherein said additive is in an amount of from about 0.1% to 1% by weight of the total weight of the dielectric means.
Claim 5
Dependent Claim
25 words
The method of claim 3 wherein said additive is in an amount of about 0.4% by weight of the total weight of the dielectric means.
Claim 6
Dependent Claim
20 words
The method of claim 1, wherein said dielectric fluid means further includes approximately 0.1% by weight of 2,6-di-tert-butyl 4-methyl phenol.
Claim 7
Dependent Claim
24 words
The method of claim 1, wherein said metallized film is deposited on a polymeric film sheet which forms part of said dielectric spacer means.
Claim 8
Dependent Claim
33 words
The method of claim 1, wherein each of said electrodes is formed by a metallized film deposited on a separate polymeric film sheet, with said polymeric film sheet forming said dielectric spacer means.
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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |