US3573575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor inpregnated with crosslinked butadiene homopolymer and method of making same
Assignee: Bendix Corp
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Filing: 1968-12-05
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Granted: 1971-04-06
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Expires: 1988-12-05
Abstract
Abstract The capacitors of this invention are impregnated with a composition having high dielectric strength, excellent insulation resistance, low dissipation factor, excellent resilience when new and after long storage, and resistance to pulse testing which is very high. Their cost is low. They involve impregnants being a liquid, hydroxyl terminated butadiene homopolymer catalytically cross-linked by diallyl isophthalate or the like. A preferred catalyst combination is revealed. Methods of impregnation are discussed.
Inventors
- 👤 Thomas G Brady
- 👤 Richard L Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:32
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31794
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
A capacitor per claim 1 in which the polybutadiene contains about 60 percent trans-1,4; 20 percent cis-1,4; and 20 percent vinyl-1,2.
Claim 2
Dependent Claim
15 words
A capacitor per claim 1 in which the composition also contains an organic peroxide catalyst.
Claim 3
Dependent Claim
17 words
A capacitor according to claim 1 in which the capacitor includes a multiplicity of layers comprising paper.
Claim 4
Dependent Claim
18 words
A capacitor according to claim 1 in which the capacitor includes a multiplicity of layers comprising reconstituted mica.
Claim 5
Dependent Claim
25 words
The capacitor of claim 1 in which the impregnant includes a catalyst being a mixture of dicumyl peroxide and 2,5-dimethyl-2,5 di (tertiary butyl peroxy) hexane.
Claim 6
Dependent Claim
97 words
A method of making impregnated capacitors which comprises impregnating a capacitor with a liquid composition according to claim 1 at a temperature of 150* -160* F. + or - 10* F. and a pressure maximum of 5 Torr absolute, soaking the impregnated capacitor, applying pressure circa 50-60 p.s.i. thereto, subjecting the capacitor to vacuum, soaking it at atmospheric pressure at 150* to 160* F. + or - 10* F., subjecting it to pressure of circa 50-60 p.s.i., returning it to atmospheric pressure at 160* F., and curing the capacitor at a temperature of 275* to 450* F.
Claim 7
Dependent Claim
31 words
The method of claim 7 in which the capacitor comprises paper and the curing temperature is first on the order of 275* F. and thereafter on the order of 300* F.
Claim 8
Dependent Claim
22 words
The method of claim 8 in which the capacitor includes reconstituted mica and the curing includes a stage at about 450* F.
Claim 9
Dependent Claim
21 words
The method of claim 7 including as a catalyst a mixture of dicumyl peroxide and 2,5-dimethyl-2,5 di (tertiary butyl peroxy) hexane.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |