US4068286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-impregnated polypropylene capacitor
Assignee: Panasonic Holdings Corp
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Filing: 1976-08-25
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Granted: 1978-01-10
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Expires: 1996-08-25
Abstract
Abstract An oil-impregnated capacitor comprising a thin insulator sheet solely consisting of a plastic film and impregnated with an insulating oil, the aptitude of which is defined by both the oil absorption and the expansion coefficient of the film.
Inventors
- 👤 Yasuo Iijima
- 👤 Tokihiko Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:49
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/22; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
An oil-impregnated capacitor comprising at least a pair of electrodes, at least one thin insulator sheet solely consisting of a polypropylene plastic film wound between said electrodes and impregnated with an insulating oil, said oil consisting essentially of an insulating oil having a physical property which allows the impregnated film to expand at 80° C by an amount no greater than 0.5 per cent over the unimpregnated film at room temperature and a physical property which allows said insulating oil to be present in the film at 80° C in an amount no greater than 10 per cent by weight of the film.
Claim 2
Dependent Claim
103 words
An oil-impregnated capacitor comprising at least a pair of electrodes, at least one thin insulator sheet solely consisting of a polypropylene plastic film wound between said electrodes and impregnated with an insulating oil, said oil consisting essentially of an insulating oil having a physical property which allows the impregnated film to expand at 80° C by an amount no greater than 0.5 per cent over the unimpregnated film at room temperature and a physical property which allows said insulating oil to be present in the film at 80° C in an amount no greater than 10 per cent by weight of the film.
Claim 3
Dependent Claim
22 words
An oil-impregnated capacitor according to claim 1, wherein said insulating oil is selected from the group consisting of diarylethane, alkylnaphthalene and dibenzyltoluene.
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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |