Patent US4480286A successfully refreshed from Google Patents.
US4480286A
Expired / Lapsed
US
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Capacitor case insulation and method of installation
Assignee: CORNELL-DUBIILIER MARKETING Inc
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Filing: 1982-01-25
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Granted: 1984-10-30
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Expires: 2002-01-25
Abstract
Abstract A power factor capacitor made with case to housing insulation of thin electrical grade polypropylene in multilayers to greatly exceed basic impulse level voltage test requirements.
Inventors
- 👤 Boyce D. Whitman
- 👤 Donald G. Beltz
- 👤 Morris T. Reese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:27
CPC Classifications
H; H01; H01G; H01G2/00; H01G2/12; H01G4/00; H01G4/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
An electrical capacitor comprising: a housing; at least one capacitor winding disposed in said housing, said capacitor winding including at least one pair of electrode films separated by a dielectric spacer film; a synthetic resin insulating film disposed in at least sixteen layers about said at least one capacitor winding as the only insulation between said capacitor and said housing, said insulating film having a thickness of not greater than 10 mils and a dielectric strength of greater than 600 volts per mil; and a dielectric liquid disposed in said housing wetting said dielectric spacer and insulating films.
Claim 2
Dependent Claim
98 words
An electrical capacitor comprising: a housing; at least one capacitor winding disposed in said housing, said capacitor winding including at least one pair of electrode films separated by a dielectric spacer film; a synthetic resin insulating film disposed in at least sixteen layers about said at least one capacitor winding as the only insulation between said capacitor and said housing, said insulating film having a thickness of not greater than 10 mils and a dielectric strength of greater than 600 volts per mil; and a dielectric liquid disposed in said housing wetting said dielectric spacer and insulating films.
Claim 3
Dependent Claim
23 words
The capacitor as claimed in claim 1 wherein said insulating film is substantially the same thickness or thicker than said dielectric spacer films.
Claim 4
Dependent Claim
17 words
The capacitor as claimed in claim 2 wherein said insulating film is an electrical grade polyolefin material.
Claim 5
Dependent Claim
13 words
The capacitor as claimed in claim 3 wherein said polyolefin material is polypropylene.
Claim 6
Dependent Claim
22 words
The capacitor as claimed in claim 1 wherein said insulating film surrounds said capacitor winding and is larger than said spacer films.
References Cited (Backward Citations)
US3014167A
Cited
DE2848180A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |