US4373176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic capacitor for at least 200 V service
Assignee: UNITED CHEMI-CON MANUFACTURING Inc
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Filing: 1981-09-30
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Granted: 1983-02-08
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Expires: 2001-09-30
Abstract
Abstract An aluminum electrolytic capacitor capable of operation at 200 VDC or higher and 130 DEG C. contains as its electrolyte a tertiary amine or a dipropylamine mono salt of dodecanedioic acid dissolved in a solvent mixture of ethylene glycol and N-methyl-2-pyrrolidinone and water.
Inventors
- 👤 Manuel Finkelstein
- 👤 Sidney D. Ross
- 👤 Franz S. Dunkl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:25
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
An aluminum electrolytic capacitor comprising two contiguously wound aluminum foil electrodes with interleaved spacers, one of said foils bearing a barrier layer dielectric oxide on its surface, and an electrolyte in contact therewith, said electrolyte comprising as solute a tertiary amine or dipropylamine mono salt of dodecanedioic acid dissolved in a solvent mixture consisting of ethylene glycol, N-methyl-2-pyrrolidinone, and water and exhibiting a resistivity at 25° C. lower than said electrolyte absent either ethylene glycol or N-methyl-2-pyrolidinone and providing a capacitor that operates at 130° C. and at least 200 V.
Claim 2
Dependent Claim
91 words
An aluminum electrolytic capacitor comprising two contiguously wound aluminum foil electrodes with interleaved spacers, one of said foils bearing a barrier layer dielectric oxide on its surface, and an electrolyte in contact therewith, said electrolyte comprising as solute a tertiary amine or dipropylamine mono salt of dodecanedioic acid dissolved in a solvent mixture consisting of ethylene glycol, N-methyl-2-pyrrolidinone, and water and exhibiting a resistivity at 25° C. lower than said electrolyte absent either ethylene glycol or N-methyl-2-pyrolidinone and providing a capacitor that operates at 130° C. and at least 200 V.
Claim 3
Dependent Claim
24 words
A capacitor according to claim 1 wherein said tertiary amine of said salt is chosen from the group consisting of trimethylamine, triethylamine, and ethylpiperidine.
Claim 4
Dependent Claim
13 words
A capacitor according to claim 2 wherein said salt is trimethylammonium hydrogen dodecanedioate.
Claim 5
Dependent Claim
13 words
A capacitor according to claim 2 wherein said salt is triethylammonium hydrogen dodecanedioate.
Claim 6
Dependent Claim
13 words
A capacitor according to claim 2 wherein said salt is N-ethylpiperidinium hydrogen dodecanedioate.
Claim 7
Dependent Claim
13 words
A capacitor according to claim 1 wherein said salt is di-n-propylammonium hydrogen dodecanedioate.
Claim 8
Dependent Claim
13 words
A capacitor according to claim 1 wherein said salt is diisopropylammonium hydrogen dodecanedioate.
Claim 9
Dependent Claim
13 words
A capacitor according to claim 1 wherein said electrolyte additionally contains a phosphate.
References Cited (Backward Citations)
US3293506A
Cited
US3351823A
Cited
US3588625A
Cited
US3609468A
Cited
US3547423A
Cited
US3812039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |