US3585467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor with microstippled dielectric
Assignee: SPRAQUE ELECTRIC CO
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Filing: 1969-08-11
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Granted: 1971-06-15
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Expires: 1989-08-11
Abstract
Abstract An electrical capacitor has at least a pair of metal electrodes convolutely wound with and the surfaces thereof separated by at least one synthetic resin dielectric film. The film is a composite of a comparatively smooth substrate having solvent deposited on at least one surface thereof a microstippling arrangement of a resin dielectric. The surface of the composite has a surface roughness equivalent in depth to from 10-40 percent of the thickness of said comparatively smooth film and has a frequency of peaks of from 50-3000 per centimeter. The capacitor is impregnated with a dielectric impregnant which is fluid at least at the time of impregnation.
Inventors
- 👤 Raynor Linzey
- 👤 Paul H Netherwood
- 👤 Herbert C Craig
- 👤 Andrew E Dequasie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:10
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
16 words
The capacitor of claim 1 wherein said solvent-deposited resin and said smooth film are both polypropylene.
Claim 2
Dependent Claim
26 words
The capacitor of claim 1 wherein said solvent-deposited resin dielectric is randomly deposited over at least a majority of the surface of said comparatively smooth film.
Claim 3
Dependent Claim
25 words
The capacitor of claim 1 wherein said solvent-deposited resin dielectric is deposited in a pattern so as to provide microstippled areas isolated from one another.
Claim 4
Dependent Claim
30 words
The capacitor of claim 1 wherein the other of said pair of electrodes is also a metallization layer having said surface irregularities on another dielectric film having said composite construction.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |