US4459637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric fluid for a capacitor
Assignee: Yosemite Investments Inc
•
Filing: 1983-05-31
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Granted: 1984-07-10
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Expires: 2003-05-31
Abstract
Abstract In a capacitor, a dielectric provides zero to about 10 weight percent of an antioxidant and glyceryl triacetate. The capacitor body includes metallized polypropylene film forming the electrodes and a separating dielectric. Air is excluded from the capacitor body during construction and dielectric fluid is prevented from impregnating the body and from imbibing into the polypropylene film by the characteristics of the glyceryl triacetate. By means of this construction, disruptive electrical or corona discharges and their harmful effects are reduced.
Inventors
- 👤 Vandos Shedigian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:43
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: 7
Claim 1
Independent Claim
23 words
In a capacitor, a dielectric fluid comprising glyceryl triacetate and 0 to about 10 wt. percent of an antioxidant or mixtures of antioxidants.
Claim 2
Dependent Claim
23 words
In a capacitor, a dielectric fluid comprising glyceryl triacetate and 0 to about 10 wt. percent of an antioxidant or mixtures of antioxidants.
Claim 3
Dependent Claim
36 words
The dielectric fluid of claim 1, wherein said antioxidant is a phenolic antioxidant and is included from 0.01 to about 10 wt. percent and said glyceryl triacetate is included from 90 to about 99.99 wt. percent.
Claim 4
Dependent Claim
40 words
A capacitor, comprising: a housing; a pair of convolutely wound metallized film electrodes enclosed within said housing; and a dielectric liquid excluding gasses from said housing and including glyceryl triacetate and 0 to about 10 wt. percent of an antioxidant.
Claim 5
Dependent Claim
40 words
A capacitor, comprising: a housing; a pair of convolutely wound metallized film electrodes enclosed within said housing; and a dielectric liquid excluding gasses from said housing and including glyceryl triacetate and 0 to about 10 wt. percent of an antioxidant.
Claim 6
Dependent Claim
30 words
The capacitor of claim 3, wherein said metallized film electrodes are formed on a plastic film selected from the group consisting of polypropylene, polyester, polycarbonate, polystyrene, polysulfone and polyethylene terphthalate.
Claim 7
Dependent Claim
13 words
The capacitor of claim 4, wherein the plastic film is biaxially oriented polypropylene.
References Cited (Backward Citations)
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Cited
US3342654A
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DE2042196A1
Cited
US3761772A
Cited
US4293433A
Cited
US4381535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |