Patent US4454567A successfully refreshed from Google Patents.
US4454567A
Expired / Lapsed
US
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Electrolytic capacitor containing a mixed solvent system
Assignee: Sprague Electric Co
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Filing: 1983-01-13
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Granted: 1984-06-12
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Expires: 2003-01-13
Abstract
Abstract An electrolytic capacitor contains an electrolyte solvent system in which one component is an acceptor in hydrogen bonding while the other component is one that can function both as acceptor and donor in hydrogen bonding. The solute or solutes present must not interact with either solvent component. When the above conditions are met, the result is an electrolyte whose resistivity curve passes through a minimum.
Inventors
- 👤 Sidney D. Ross
- 👤 Manuel Finkelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:22
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
An electrolytic capacitor comprising a plurality of spaced electrodes, at least one of which is coated with a barrier layer dielectric oxide, interleaved spacers, and an electrolyte in contact therewith, said electrolyte comprising a solute dissolved in a solvent system wherein at least one first component functions as both an acceptor and as a donor in hydrogen bond formation and at least one second component functions only as an acceptor in hydrogen bond formation, said electrolyte having a resistivity curve which passes through a minimum point, all solute present is characterized by being non-reacting with any solvent component, said electrolyte composition being adjusted to provide said minimum resistivity.
Claim 2
Dependent Claim
108 words
An electrolytic capacitor comprising a plurality of spaced electrodes, at least one of which is coated with a barrier layer dielectric oxide, interleaved spacers, and an electrolyte in contact therewith, said electrolyte comprising a solute dissolved in a solvent system wherein at least one first component functions as both an acceptor and as a donor in hydrogen bond formation and at least one second component functions only as an acceptor in hydrogen bond formation, said electrolyte having a resistivity curve which passes through a minimum point, all solute present is characterized by being non-reacting with any solvent component, said electrolyte composition being adjusted to provide said minimum resistivity.
Claim 3
Dependent Claim
28 words
A capacitor according to claim 1 wherein said first solvent component is chosen from the group of carboxylic acids, hydroxylic solvents, alcohol ethers, N-unsubstituted amides, and mono-N-substituted amides.
Claim 4
Dependent Claim
31 words
A capacitor according to claim 2 wherein said first solvent component is chosen from the group of ethylene glycol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, 1,2-propanediol, N-methylpropionamide and 2-pyrrolidinone.
Claim 5
Dependent Claim
94 words
A process for formulating an electrolytic capacitor comprising selecting a solute according to temperature, conductivity and voltage requirements, selecting a first solvent from the classes of those having both donor and acceptor functions in hydrogen bond formation and of those having acceptor function only, then according to final resistivity desired selecting a second solvent from the unchosen of said classes, all solute present being non-reactive with any solvent component, determining the resistivity curve, said electrolyte having a resistivity curve which passes through a minimum, and adjusting said electrolyte composition to provide said minimum resistivity.
Claim 6
Dependent Claim
94 words
A process for formulating an electrolytic capacitor comprising selecting a solute according to temperature, conductivity and voltage requirements, selecting a first solvent from the classes of those having both donor and acceptor functions in hydrogen bond formation and of those having acceptor function only, then according to final resistivity desired selecting a second solvent from the unchosen of said classes, all solute present being non-reactive with any solvent component, determining the resistivity curve, said electrolyte having a resistivity curve which passes through a minimum, and adjusting said electrolyte composition to provide said minimum resistivity.
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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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |