US4626959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric fluid for metallized capacitors
Assignee: Yosemite Investments Inc
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Filing: 1984-09-04
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Granted: 1986-12-02
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Expires: 2004-09-04
Abstract
Abstract A dielectric fluid for a metallized polypropylene film capacitor including about 90% to about 100% by volume glycenyl tri (epoxy acetoxystearate) or glyceryl tri (acetoxystearate), each being an ester with about 90% acetostearic acid.
Inventors
- 👤 Vandos Shedigian
- 👤 Gerald A. Voyles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:59
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; H01B; H01B3/00; H01B3/18; H01B3/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
In a metallized polypropylene film capacitor including a casing containing a capacitor roll section having a pair of spaced apart electrodes, a polypropylene sheet for separating the electrodes, and a dielectric fluid adjacent said electrodes, in said casing, the dielectric fluid comprising about 90% to about 100% by volume of glyceryl tri(epoxy acetoxystearate).
Claim 2
Dependent Claim
53 words
In a metallized polypropylene film capacitor including a casing containing a capacitor roll section having a pair of spaced apart electrodes, a polypropylene sheet for separating the electrodes, and a dielectric fluid adjacent said electrodes, in said casing, the dielectric fluid comprising about 90% to about 100% by volume of glyceryl tri(epoxy acetoxystearate).
Claim 3
Dependent Claim
24 words
The capacitor in claim 1 wherein the dielectric fluid swells the polypropylene film from about 0.3% to about 0.5% by volume dependent on temperature.
Claim 4
Dependent Claim
22 words
The capacitor of claim 2 wherein the dielectric fluid includes from about 0% to about 10% andioxidant by weight of dielectric fluid.
Claim 5
Dependent Claim
12 words
The capacitor of claim 3 wherein the antioxidant is a butylated hydroxytoluene.
Claim 6
Dependent Claim
14 words
A dielectric fluid comprising about 90% to about 100% by volume glyceryl tri(epoxy acetoxystearate).
Claim 7
Dependent Claim
14 words
A dielectric fluid comprising about 90% to about 100% by volume glyceryl tri(epoxy acetoxystearate).
Claim 8
Dependent Claim
16 words
The dielectric fluid of claim 5 including from 0% to about 10% by volume butylated hydroxytoluene.
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) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |