Patent US4054680A successfully refreshed from Google Patents.
US4054680A
Expired / Lapsed
US
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Method of fabricating improved capacitors and transformers
Assignee: General Electric Co
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Filing: 1976-06-28
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Granted: 1977-10-18
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Expires: 1996-06-28
Abstract
Abstract Before impregnation with fluid a capacitor roll, or a transformer core and coil, is filled with a monomeric gas that is thereafter polymerized, in situ, in a plasma discharge. Formation of solid polymer occurs at the regions of most intense electric field, thereby raising both corona-start and operating voltage for these devices.
Inventors
- 👤 Amandus H. Sharbaugh
- 👤 David G. Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:19
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A process for increasing corona-start voltage and operating voltage of a device to be fluid-impregnated, said device including a layer of insulating material between two layers of conductor, said process comprising: maintaining said device in an atmosphere of unsaturated monomeric gas; and converting said unsaturated monomeric gas to solid polymer at regions of high electric stress in said device when a voltage is applied across said two layers of conductor.
Claim 2
Dependent Claim
70 words
A process for increasing corona-start voltage and operating voltage of a device to be fluid-impregnated, said device including a layer of insulating material between two layers of conductor, said process comprising: maintaining said device in an atmosphere of unsaturated monomeric gas; and converting said unsaturated monomeric gas to solid polymer at regions of high electric stress in said device when a voltage is applied across said two layers of conductor.
Claim 3
Dependent Claim
41 words
The process of claim 1 wherein the step of converting said monomeric gas to solid polymer comprises applying an increasing voltage across said two layers of conductor until discharge pulses across said device show a sustained magnitude at a predetermined level.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said gas comprises one of the group consisting of vinylidene fluoride and acrylonitrile.
Claim 5
Dependent Claim
19 words
The process of claim 2 wherein said gas comprises one of the group consisting of vinylidene fluoride and acrylonitrile.
Claim 6
Dependent Claim
17 words
The process of claim 1 including the additional step of impregnating said device with a dielectric fluid.
Claim 7
Dependent Claim
17 words
The process of claim 2 including the additional step of impregnating said device with a dielectric fluid.
Claim 8
Dependent Claim
17 words
The process of claim 4 including the additional step of impregnating said device with a dielectric fluid.
References Cited (Backward Citations)
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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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |