US4110496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric system for an electrical apparatus
Assignee: Cooper Industries LLC
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Filing: 1976-10-22
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Granted: 1978-08-29
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Expires: 1996-10-22
Abstract
Abstract An improved dielectric system for an electrical apparatus. The dielectric system includes a polymeric film impregnated with low molecular weight polybutene having an average number molecular weight in the range of 300 to 500. The dielectric system has improved dielectrical properties and the polybutene is biodegradable which minimizes the pollution of the atmosphere if the dielectric liquid is exposed to the atmosphere. Further extended service life can be achieved by the addition of a cyclohexyl amine to the liquid dielectric.
Inventors
- 👤 John Lapp
- 👤 Fred S. Sadler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:29
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; H01G4/222; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A dielectric system for use in an electrical apparatus, comprising a layer of polymeric material, and a liquid dielectric impregnated into said polymeric material, said liquid dielectric comprising polybutene having an average number molecular weight in the range of 300 to 500 and containing from 0.01 to 10% by weight of a cyclohexylamine and from 0.05 to 15% by weight of a compound selected from the group consisting of butylated hydroxy toluene and di-tert-butyl-p-cresol.
Claim 2
Dependent Claim
74 words
A dielectric system for use in an electrical apparatus, comprising a layer of polymeric material, and a liquid dielectric impregnated into said polymeric material, said liquid dielectric comprising polybutene having an average number molecular weight in the range of 300 to 500 and containing from 0.01 to 10% by weight of a cyclohexylamine and from 0.05 to 15% by weight of a compound selected from the group consisting of butylated hydroxy toluene and di-tert-butyl-p-cresol.
Claim 3
Dependent Claim
82 words
A dielectric system for use in an electrical apparatus, comprising a layer of polymeric material, and a liquid dielectric impregnated into said polymeric material, said liquid dielectric comprising polybutene having an average number molecular weight in the range of 300 to 500 and containing from 0.01 to 10% by weight of a cyclohexylamine, from 0.3 to 20% by weight of trichlorobenzene, and from 0.05 to 15% by weight of a compound selected from the groups consisting of buylated hydroxy toluene and di-tert-butyl-p-cresol.
Claim 4
Dependent Claim
82 words
A dielectric system for use in an electrical apparatus, comprising a layer of polymeric material, and a liquid dielectric impregnated into said polymeric material, said liquid dielectric comprising polybutene having an average number molecular weight in the range of 300 to 500 and containing from 0.01 to 10% by weight of a cyclohexylamine, from 0.3 to 20% by weight of trichlorobenzene, and from 0.05 to 15% by weight of a compound selected from the groups consisting of buylated hydroxy toluene and di-tert-butyl-p-cresol.
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |