US3761772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical capacitor
Assignee: Toray Industries Inc
•
Filing: 1973-01-26
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Granted: 1973-09-25
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Expires: 1993-01-26
Abstract
Abstract An oil-impregnated electrical capacitor, the dielectric spacer of which comprises a bi-axially oriented polypropylene film having at least one surface laminated with a propylene-ethylene copolymer layer, surface roughened by embossing, having 0.5 - 7.0 wt percent of ethylene units based on the total weight of the copolymer.
Inventors
- 👤 M Suzuki
- 👤 K Sagarifuji
- 👤 T Fusayama
- 👤 T Hashimoto
- 👤 T Yoshiii
- 👤 Y Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:00
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
The capacitor of claim 1 wherein the propylene-ethylene copolymer has an ethylene unit content of 0.5 - 3.0 wt percent based on the total weight of the copolymer.
Claim 2
Dependent Claim
19 words
The capacitor of claim 1 wherein the copolymer surface is embossed to a roughness of 3 - 500 mesh.
Claim 3
Dependent Claim
19 words
The capacitor of claim 1 wherein the copolymer surface is embossed to a roughness of 10 - 200 mesh.
References Cited (Backward Citations)
US3430116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |