Patent US3796934A successfully refreshed from Google Patents.
US3796934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor with non-halogenated impregnant
Assignee: Monsanto Co
•
Filing: 1972-08-16
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Granted: 1974-03-12
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Expires: 1992-08-16
Abstract
Abstract Electrical capacitors are impregnated with liquid dielectric compositions comprising mixtures of diaryl sulfones and halogenfree aromatic organic compounds.
Inventors
- 👤 R Munch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:04
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
26 words
A capacitor of claim 1 wherein said dielectric composition comprises from about 10 to 80 percent by weight of a diaryl sulfone represented by the structure
Claim 2
Dependent Claim
34 words
A capacitor of claim 1 wherein said dielectric fluid composition comprises from about 70 to 90 percent by weight of isopropyl biphenyl, and from about 0.1 to 3 percent by weight of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate.
Claim 3
Dependent Claim
23 words
A capacitor of claim 3 wherein the solid dielectric sheet is selected from the group consisting of paper, polyolefin film, and combinations thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |