US3833978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized ester impregnant
Assignee: General Electric Co
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Filing: 1973-06-12
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Granted: 1974-09-10
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Expires: 1993-06-12
Abstract
Abstract A high temperature and extended time method of impregnating electrical capacitors with an epoxy stabilized dielectric liquid aromatic ester.
Inventors
- 👤 J Eustance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:20
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; C; C10; C10M; C10M2203/00; C10M2203/06; C10M2205/00; C10M2205/02; C10M2205/026; C10M2207/00; C10M2207/04; C10M2207/042; C10M2207/28; C10M2207/282; C10M2207/284; C10M2207/285; C10M2207/287; C10M2207/289; C10M2207/34; C10M2207/40; C10M2207/402; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
The invention as recited in claim 1 wherein said capacitor utilizes paper in its dielectric system and said bake out process is continued for at least about 24 hours.
Claim 2
Dependent Claim
24 words
The invention as recited in claim 1 wherein after said heat soak said capacitor is cooled and thereafter the said heat soak is repeated.
Claim 3
Dependent Claim
43 words
The invention as recited in claim 1 wherein a. said aromatic ester is purified by a column refining process and remove essentially all foreign materials and at least 1.0% by weight of an epoxide is added to said aromatic ester to dissolve therein.
Claim 4
Independent Claim
105 words
A method of impregnating an electrical capacitor utilizing a dielectric consisting essentially of a synthetic resin film comprising a. assembling said capacitor in a casing, b. subjecting said capacitor to an evacuation process while at a temperature in a range of substantially below 100*C to about room temperature, c. filling said casing while under evacuation in said temperature range with an ester impregnant having dissolved therein an epoxide compound of greater than about 0.01% by weight, d. thereafter heat soaking said capacitor for at least about 4 hours at a temperature between about 100*C and 140*C for essentially complete impregnation of the synthetic resin film.
Claim 5
Dependent Claim
20 words
The invention as recited in claim 5 wherein said evacuation and filling processes are carried out substantially at room temperature.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |