US3724043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
The method of making a capacitor with a preimpregnated dielectric
Assignee: General Electric Co
•
Filing: 1971-05-13
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Granted: 1973-04-03
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Expires: 1991-05-13
Abstract
Abstract A liquid dielectric capacitor impregnant such as a halogenated aromatic hydrocarbon, castor oil, or mineral oil is added to finely divided polypropylene resin and thoroughly mixed therein. The resulting composition is then passed through a high temperature apparatus to produce capacitor grade polypropylene film. This film may contain the impregnant in significant amounts up to and exceeding about 20 percent by weight. An epoxide stabilizer material may also be preincorporated in the resin or added to the liquid impregnant. After a capacitor has been made with the preincorporated impregnant, the capacitor is impregnated to increase the amount of liquid dielectric therein.
Inventors
- 👤 J Eustance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:16
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; H01G4/222; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
12 words
The invention as recited in claim 1 wherein said impregnant comprises trichlorodiphenyl.
Claim 2
Dependent Claim
14 words
The invention as recited in claim 1 wherein said film contains an epoxide stabilizer.
Claim 3
Dependent Claim
16 words
The invention as recited in claim 1 wherein said impregnation is carried out under vacuum conditions.
Claim 4
Dependent Claim
19 words
The invention as recited in claim 1 wherein said impregnation is carried out at elevated temperatures above about 80*C.
Claim 5
Dependent Claim
13 words
The invention as recited in claim 2 wherein said film is biaxially oriented.
Claim 6
Dependent Claim
15 words
The invention as recited in claim 2 wherein said incorporated impregnant contains an epoxide stabilizer.
Claim 7
Dependent Claim
17 words
The invention as recited in claim 4 wherein said film is less than about 0.001 inch thickness.
Claim 8
Dependent Claim
17 words
The invention as recited in claim 1 wherein said film constitutes the sole dielectric in said roll.
Claim 9
Dependent Claim
21 words
The invention as recited in claim 2 wherein said impregnant comprises substantially an equilibrium solution of said trichlorodiphenyl in said polypropylene.
Claim 10
Independent Claim
72 words
A method of producing a capacitor comprising a. adding liquid trichlorodiphenyl to finely divided polypropylene b. vigorously agitating the materials to provide a uniform mixture c. forming the mixture at temperatures at least about 170*C into a thin film d. biaxially orienting said film e. winding a capacitor roll section of two electrodes with said film f. submerging said roll in liquid trichlorodiphenyl at elevated temperatures to increase the trichlorodiphenyl content thereof.
Claim 11
Independent Claim
98 words
A method of making a capacitor roll section comprising a. providing a pair of foil electrode strips with biaxially oriented polypropylene strip adjacent at least one of said electrode strips and a porous material adjacent said polypropylene strip b. said polypropylene strip being a relatively dry strip containing trichlorodiphenyl in an amount between about 1 to 20 percent by weight of polypropylene c. winding said strip into a capacitor roll section subjecting said roll section to evacuation d. and impregnating said roll section by submerging it in liquid trichlorodiphenyl at elevated temperatures to increase the trichlorodiphenyl content thereof.
Claim 12
Independent Claim
80 words
A method of making a capacitor comprising in combination a. winding a capacitor roll section of two electrodes with a biaxially oriented polypropylene film having impregnated therein a chlorodiphenyl in an amount between about 1% and 20% by weight of polypropylene b. inserting said roll section in a capacitor casing c. evacuating the casing d. filling said casing with liquid chlorodiphenyl to submerge and impregnate said capacitor roll section and increase the chlorodiphenyl content thereof e. and sealing said casing.
References Cited (Backward Citations)
GB1045527A
Cited
US3440212A
Cited
US3363156A
Cited
US3445394A
Cited
US3424957A
Cited
US3430116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |