Patent US3754173A successfully refreshed from Google Patents.
US3754173A
Expired / Lapsed
US
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Stabilized ester impregnated capacitor
Assignee: Individual
•
Filing: 1972-08-16
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Granted: 1973-08-21
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Expires: 1992-08-16
Abstract
Abstract A capacitor impregnant comprises an aromatic ester such as dioctyl phthalate which has been stabilized with between about 0.1 and 10 percent by weight of an epoxide such as diglycidyl ether of bisphenol A dissolved therein.
Inventors
- 👤 J Eustance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:03
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
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
18 words
The invention as in claim 5 wherein said additive is a high molecular weight low volatility liquid epoxide.
Claim 2
Dependent Claim
15 words
The invention as recited in claim 5 wherein said aromatic ester is a phthalate ester.
Claim 3
Dependent Claim
13 words
The invention as recited in claim 1 wherein said aromatic ester is DOP.
Claim 4
Dependent Claim
17 words
The invention as recited in claim 1 wherein said epoxide is a diglycidyl ether of bisphenol A.
Claim 5
Dependent Claim
20 words
The invention as in claim 1 wherein epoxide is added in an amount from 0.1 to 10 percent by weight.
Claim 6
Dependent Claim
19 words
The invention as in claim 1 wherein a paper dielectric is at least a part of said dielectric material.
Claim 7
Dependent Claim
18 words
The invention as in claim 1 wherein a synthetic resin is at least a part of said dielectric.
Claim 8
Dependent Claim
17 words
The invention as in claim 1 wherein polypropylene is at least a part of said dielectric material.
Claim 9
Dependent Claim
16 words
The invention in claim 1 wherein said dielectric comprises a mixed dielectric of polypropylene and paper.
Claim 10
Dependent Claim
13 words
The invention in claim 1 wherein paper comprises all the said dielectric material.
Claim 11
Dependent Claim
15 words
The invention as in claim 1 wherein a synthetic resin comprises all the dielectric material.
Claim 12
Dependent Claim
13 words
The invention is claim 12 wherein polypropylene comprises all the said dielectric material.
Claim 13
Dependent Claim
58 words
The invention as in claim 9 wherein said polypropylene is under an AC voltage stress at the application voltage of said capacitor of from about 750 to in excess of 1,200 volts per mil thickness of said polypropylene and said capacitor has a long life low power factor of less than about 1.0 percent measured at room temperature.
Claim 14
Dependent Claim
34 words
The invention as recited in claim 18 wherein said voltage stress is in excess of about 900 volts per mil and said capacitor has an operable power factor of less than about 0.5 percent.
Claim 15
Dependent Claim
21 words
The invention as recited in claim 12 wherein said pair of electrodes comprise a metallized surface on a synthetic resin strip.
Claim 16
Dependent Claim
15 words
The invention as recited in claim 16 wherein said strip and said dielectric comprises polypropylene.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |