Patent US3857073A successfully refreshed from Google Patents.
US3857073A
Expired / Lapsed
US
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Capacitor with polypropylene dielectric
Assignee: Shizuki Electrical Manufacturing Co Ltd
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Filing: 1973-04-10
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Granted: 1974-12-24
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Expires: 1993-04-10
Abstract
Abstract A paper/polypropylene film composite dielectric capacitor having a dielectric arrangement, wherein one of a pair of electrode foils is narrower in width, with its both edges made recessed foil edges in relation to the other electrode and its both surfaces kept in contact with paper, thereby improving overvoltage endurance to a large extent.
Inventors
- 👤 T Yagitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:06
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
IN A DIELECTRIC LIQUID IMPREGNATED PAPER/POLYPROPYLENE FILM COMPOSITE WOUND FOIL TYPE DIELECTRIC CAPACITOR INCLUDING A FIRST ELECTRODE AND A SECOND ELECTRODE POSITIONED IN PARALLEL WITH AND OPPOSITE TO SAID FIRST ELECTRODE, SAID FIRST ELECTRODE BEING NARROWER IN WIDTH THAN SAID SECOND ELELCTRODE AND SAID CAPACITOR HAVING INTERLEAVED LAYERS OF SAID PAPER AND POLYPROPYLENE FILM, THE IMPROVEMENT COMPRISING BOTH SIDES OF SAID FIRST ELECTRODE BEING IN CONTACT WITH SAID PAPER AND SAID SECOND ELECTRODE BEING IN CONTACT WITH SAID PAPER AND SAID SECSAID ELECTRODES BEING SEPARATED BY AT LEAST ONE LAYER OF INTERSPACED FILM PAPER.
Claim 2
Dependent Claim
94 words
IN A DIELECTRIC LIQUID IMPREGNATED PAPER/POLYPROPYLENE FILM COMPOSITE WOUND FOIL TYPE DIELECTRIC CAPACITOR INCLUDING A FIRST ELECTRODE AND A SECOND ELECTRODE POSITIONED IN PARALLEL WITH AND OPPOSITE TO SAID FIRST ELECTRODE, SAID FIRST ELECTRODE BEING NARROWER IN WIDTH THAN SAID SECOND ELELCTRODE AND SAID CAPACITOR HAVING INTERLEAVED LAYERS OF SAID PAPER AND POLYPROPYLENE FILM, THE IMPROVEMENT COMPRISING BOTH SIDES OF SAID FIRST ELECTRODE BEING IN CONTACT WITH SAID PAPER AND SAID SECOND ELECTRODE BEING IN CONTACT WITH SAID PAPER AND SAID SECSAID ELECTRODES BEING SEPARATED BY AT LEAST ONE LAYER OF INTERSPACED FILM PAPER.
Claim 3
Dependent Claim
17 words
The improved device of claim 1 wherein both sides of said second electrode contact said polypropylene film.
References Cited (Backward Citations)
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US901498A
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US1568918A
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US2526321A
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US3048750A
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US3363156A
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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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |