Patent US3646403A successfully refreshed from Google Patents.
US3646403A
Expired / Lapsed
US
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High-voltage electrolytic capacitor
Assignee: Sprague Electric Co
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Filing: 1970-10-23
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Granted: 1972-02-29
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Expires: 1990-10-23
Abstract
Abstract An electrolytic capacitor suitable for operating at high voltages is produced by combining a glycol-borate electrolyte together with N-methyl pyrrolidone and a moderately hydrogenbonding solvent. The electrolytic capacitor has a wide range of temperature conditions, operates at high voltages and retains stable electrical characteristics at these levels.
Inventors
- 👤 Franz S Dunkl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:10
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
The capacitor of claim 1 wherein said electrolyte includes ammonium dihydrogen phosphate and said borate is ammonium pentaborate.
Claim 2
Dependent Claim
35 words
The electrolytic capacitor of claim 2 wherein said electrolyte comprises a mixture in percent by weight of: Glycol 30-45% Ammonium pentaborate 15-25% Boric acid 5-13% Ammonium dihydrogen phosphate 0-0.8% N-methyl pyrrolidone 15-20% 2-methoxy ethanol 15-20%.
Claim 3
Dependent Claim
35 words
The electrolytic capacitor of claim 2 wherein said electrolyte comprises a mixture in percent by weight of: Glycol 36.5% Ammonium pentaborate 19.4% Boric acid 9.4% Ammonium dihydrogen phosphate 0.1% N-methyl pyrrolidone 17.3% 2-methoxy ethanol 17.3%.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |