US4521826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric fluid for a compacitor
Assignee: Yosemite Investments Inc
•
Filing: 1980-02-25
•
Granted: 1985-06-04
•
Expires: 2000-02-25
Abstract
Abstract In a capacitor, a dielectric fluid including 0 to about 10 wt. % of an antioxidant, 0 to about 10 wt. % of an epoxide stabilizer, the remainder essentially a compound with more than two stearate groups. The presently preferred compound of the dielectric fluid is glyceryl tri(acetoxystearate). A primary function of the dielectric fluid is to help prevent air from contacting the capacitor body of the capacitor. The capacitor body includes as its dielectric a plastic film such as polypropylene and the above mentioned dielectric fluid. Air pockets in and around the capacitor body are impregnated with such fluid to minimize disruptive electrical or corona discharges without harmfully swelling the plastic film to thereby improve the operating efficiency of such capacitor.
Inventors
- 👤 Vandos Shedigian
- 👤 Gerald A. Voyles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:16
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; H01G4/06; H01G4/14; H01G4/18; H01G4/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
In a capacitor, a dielectric fluid including 0 to about 10 wt. % of an anti-oxidant or mixtures of anti-oxidant, 0 to about 10 wt. % of an epoxide stabilizer or mixtures of epoxide stabilizers, the remainder essentially glyceryl tri(acetoxystearate).
Claim 2
Dependent Claim
40 words
In a capacitor, a dielectric fluid including 0 to about 10 wt. % of an anti-oxidant or mixtures of anti-oxidant, 0 to about 10 wt. % of an epoxide stabilizer or mixtures of epoxide stabilizers, the remainder essentially glyceryl tri(acetoxystearate).
Claim 3
Dependent Claim
37 words
In the capacitor of claim 1, wherein the fluid includes about 0.01 to about 10 wt. % of a phenolic antioxidant, about 0.001 to about 10 wt. % of an epoxide stabilizer, the remainder essentially glyceryl tri(acetoxystearate).
Claim 4
Dependent Claim
28 words
A capacitor comprising a pair of electrically conductive electrodes and a dielectric separating the electrodes, the dielectric including a plastic film and the dielectric fluid of claim 1.
Claim 5
Dependent Claim
30 words
The capacitor of claim 3, wherein the plastic film is selected from the group consisting of polypropylene, polyester, polycarbonate, polystyrene, polysulfone and polyethylene terephthalate, and the dielectric is glyceryl tri(acetoxystearate).
Claim 6
Dependent Claim
19 words
The capacitor of claim 3, wherein the plastic film is biaxially oriented polypropylene and the dielectric is glyceryl tri(acetoxystearate).
Claim 7
Dependent Claim
48 words
The capacitor of claim 3, wherein the plastic film consists essentially of biaxially oriented polypropylene and the fluid consists essentially of about 0.01 to about 10 wt. % of a phenolic antioxidant, about 0.001 to about 10 wt. % of an epoxide stabilizer, the remainder essentially glyceryl tri(acetoxystearate).
Claim 8
Dependent Claim
31 words
A convolutely wound a-c capacitor comprising a pair of metallized electrically conductive electrodes and a dielectric system separating the electrodes, the dielectric system including biaxially oriented polypropylene film and glyceryl tri(acetoxystearate).
Claim 9
Dependent Claim
31 words
A convolutely wound a-c capacitor comprising a pair of metallized electrically conductive electrodes and a dielectric system separating the electrodes, the dielectric system including biaxially oriented polypropylene film and glyceryl tri(acetoxystearate).
Claim 10
Dependent Claim
32 words
The capacitor of claim 7, wherein the dielectric system thereof also includes one or more of an epoxide stabilizing agent, an antioxidant, DB castor oil, mineral oil, dioctyl phthalate and diisononyl phthalate.
References Cited (Backward Citations)
US1952158A
Cited
US2512886A
Cited
US2700022A
Cited
FR2047398A5
Cited
US3855508A
Cited
DE2427812A1
Cited
GB1490581A
Cited
CA1012621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |