US3900774A
Expired / Lapsed
US
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Oil-impregnated capacitor
Assignee: Panasonic Holdings Corp
•
Filing: 1973-12-26
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Granted: 1975-08-19
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Expires: 1993-12-26
Abstract
Abstract An oil-impregnated capacitor has a plastic dielectric with a haze value greater than 20%. The haze results in a higher CSV and breakdown voltage. The plastic can also be roughened.
Inventors
- 👤 Yasuo Iijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:45
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/06; H01G4/14; H01G4/145; H01G4/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
AN OIL-IMPREGNATED CAPACITOR HAVING A THIN INSULATOR SHEET SANDWICHED BETWEEN TWO ELECTRODES, SAID THIN INSULATOR SHEET CONSISTING OF A PLASTIC FILM HAVING HAZE NO LOWER THAN 20 PERCENT.
Claim 2
Dependent Claim
28 words
AN OIL-IMPREGNATED CAPACITOR HAVING A THIN INSULATOR SHEET SANDWICHED BETWEEN TWO ELECTRODES, SAID THIN INSULATOR SHEET CONSISTING OF A PLASTIC FILM HAVING HAZE NO LOWER THAN 20 PERCENT.
Claim 3
Dependent Claim
22 words
The oil-impregnated capacitor according to claim 1, wherein the total light transmission of said plastic film is no lower than 80 percent.
Claim 4
Dependent Claim
25 words
The oil-impregnated capacitor according to claim 1, wherein the surface roughness of said plastic film is within a range between 0.3 and 1.5 Mu Ra.
Claim 5
Dependent Claim
18 words
The oil-impregnated capacitor according to claim 1, wherein said thin insulator sheet solely consists of the plastic film.
Claim 6
Dependent Claim
17 words
The oil-impregnated capacitor according to claim 4, wherein said electrodes are constituted by a metal evaporation film.
Claim 7
Dependent Claim
15 words
The oil-impregnated capacitor according to claim 4, wherein said plastic film is made of polypropylene.
References Cited (Backward Citations)
US3363156A
Cited
US3585467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |