Patent US4774011A successfully refreshed from Google Patents.
US4774011A
Expired / Lapsed
US
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Electrolyte for aluminum electrolytic capacitor
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-05-18
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Granted: 1988-09-27
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Expires: 2007-05-18
Abstract
Abstract An electrolyte for use in an aluminum electrolytic capacitor is described. The electrolyte comprises a solution of a quaternary phosphonium salt as a solute dissolved in an aprotic solvent. The electrolyte can reduce internal resistance of the electrolytic capacitor and broaden the temperature range over which the electrolytic capacitor can be used.
Inventors
- 👤 Shoichiro Mori
- 👤 Makoto Ue
- 👤 Kazuhiko Ida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:52
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G11/00; H01G11/54; H01G11/58; H01G11/62; H01G9/035; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
An electrolyte for an aluminum electrolytic capacitor, comprising a solution of from 0.1 to 40% by weight based on the weight of the electrolyte of a quaternary phosphonium salt dissolved in an aprotic solvent selected from the group consisting of amide, lactone, carbonate, nitrile and phosphoric acid ester solvents, wherein the anion component of said quaternary phosphonium salt is a conjugate base of an organic or inorganic acid and wherein the quaternary phosphonium cation of said quaternary phosphonium salt has the formula (I): ##STR6## wherein, R 1 , R 2 , R 3 and R 4 each represent an alkyl group having from 1 to 10 carbon atoms, and wherein two of said alkyl groups that are adjacent to each other are combinable to form a alicyclic ring.
Claim 2
Dependent Claim
128 words
An electrolyte for an aluminum electrolytic capacitor, comprising a solution of from 0.1 to 40% by weight based on the weight of the electrolyte of a quaternary phosphonium salt dissolved in an aprotic solvent selected from the group consisting of amide, lactone, carbonate, nitrile and phosphoric acid ester solvents, wherein the anion component of said quaternary phosphonium salt is a conjugate base of an organic or inorganic acid and wherein the quaternary phosphonium cation of said quaternary phosphonium salt has the formula (I): ##STR6## wherein, R 1 , R 2 , R 3 and R 4 each represent an alkyl group having from 1 to 10 carbon atoms, and wherein two of said alkyl groups that are adjacent to each other are combinable to form a alicyclic ring.
Claim 3
Dependent Claim
13 words
The electrolyte as claimed in claim 1, wherein the aprotic solvent is γ-butyrolactone.
Claim 4
Dependent Claim
51 words
The electrolyte as claimed in claim 1, wherein the anion component of said quaternary phosphonium salt is a conjugate base of an acid selected from the group consisting of an organic weak acid having a pKa of at least 1.0 and an inorganic weak acid having pKa of at least 1.0.
References Cited (Backward Citations)
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Cited
US3223639A
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US3325697A
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US3547423A
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JPS549704A
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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) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |