US4121275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester dielectric fluid containing tert-butyl anthraquinone
Assignee: Sprague Electric Co
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Filing: 1977-06-27
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Granted: 1978-10-17
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Expires: 1997-06-27
Abstract
Abstract An ester dielectric fluid for an AC capacitor with improved corona properties contains a minor amount of tert-butylanthraquinone. The ester may be 2-ethylhexylphthalate or diisononylphthalate, and an epoxide stabilizer is present.
Inventors
- 👤 Sidney D. Ross
- 👤 Raynor Linzey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:41
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; H01B; H01B3/00; H01B3/18; H01B3/20; H01G4/06; H01G4/14; H01G4/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
42 words
An AC capacitor comprising a plurality of electrodes separated by a dielectric spacer and a dielectric fluid composition impregnating said spacer and consisting of diisononylphthalate, up to 1% of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate as stabilizer, and up to 2% tert-butylanthraquinone to increase corona start voltage.
Claim 2
Dependent Claim
42 words
An AC capacitor comprising a plurality of electrodes separated by a dielectric spacer and a dielectric fluid composition impregnating said spacer and consisting of diisononylphthalate, up to 1% of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate as stabilizer, and up to 2% tert-butylanthraquinone to increase corona start voltage.
Claim 3
Dependent Claim
22 words
An AC capacitor according to claim 1 wherein said fluid consists of diisononylphthalate stabilized by 0.5% of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate and containing 1% tert-butylanthraquinone.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |