US4399489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature electrolytic capacitor
Assignee: UNITED CHEMI-CON MANUFACTURING Inc
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Filing: 1982-03-25
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Granted: 1983-08-16
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Expires: 2002-03-25
Abstract
Abstract An aluminum electrolytic capacitor for high temperature operation contains a wound aluminum foil capacitor section in contact with an electrolyte capable of operating as high as 150 DEG C., the electrolyte comprising a mixed solvent system of N-methylpyrrolidinone and up to 5 wt % ethylene glycol and a mixed solute system of dimethylammonium or diisopropylammonium boro-di-catecholate and diisopropylammonium pentaborate.
Inventors
- 👤 Sidney D. Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:55
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
An electrolytic capacitor having a wound capacitor section having an etched aluminum foil anode bearing a dielectric oxide barrier layer, an aluminum foil cathode, spacer material interleaved between said anode and said cathode and contiguously wound therewith, and an electrolyte in contact therewith, said electrolyte comprising N-methylpyrrolidinone and up to 5 wt% ethylene glycol as solvent and a solute mixture of diisopropylammonium pentaborate and dimethylammonium or diisopropylammonium boro-di-catecholate, said electrolyte affording capacitor operation at 130° to 150° C.
Claim 2
Dependent Claim
78 words
An electrolytic capacitor having a wound capacitor section having an etched aluminum foil anode bearing a dielectric oxide barrier layer, an aluminum foil cathode, spacer material interleaved between said anode and said cathode and contiguously wound therewith, and an electrolyte in contact therewith, said electrolyte comprising N-methylpyrrolidinone and up to 5 wt% ethylene glycol as solvent and a solute mixture of diisopropylammonium pentaborate and dimethylammonium or diisopropylammonium boro-di-catecholate, said electrolyte affording capacitor operation at 130° to 150° C.
Claim 3
Dependent Claim
21 words
A capacitor according to claim 1 wherein said mixed solute is prepared at least in part in-situ in said solvent system.
Claim 4
Dependent Claim
29 words
A capacitor according to claim 2 wherein said electrolyte contains 86.6 wt% N-methylpyrrolidinone, 5.0 wt% ethylene glycol, 2.0 wt% diisopropylamine, 6.0 wt% boric acid, and 0.4 wt% dimethylammonium boro-di-catecholate.
Claim 5
Dependent Claim
29 words
A capacitor according to claim 2 wherein said electrolyte contains 86.6 wt% N-methylpyrrolidinone, 4.9 wt% ethylene glycol, 5.9 wt% boric acid, 2.0 wt% diisopropylamine, and 0.6 wt% diisopropylammonium boro-di-catecholate.
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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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |