Patent US4373177A successfully refreshed from Google Patents.
US4373177A
Expired / Lapsed
US
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High temperature electrolytic capacitor
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 A high-temperature aluminum electrolytic capacitor contains an electrolyte of mono(di-n-propylammonium) adipate or mono(diisopropylammonium) adipate, a phosphate salt, and water dissolved in ethylene glycol to provide a capacitor capable of operating at least at 200 VDC and 130 DEG C.
Inventors
- 👤 Manuel Finkelstein
- 👤 Franz S. Dunkl
- 👤 Sidney D. Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:02
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A high-temperature aluminum electrolytic capacitor comprising two aluminum electrode foils, with one of said foils bearing a barrier layer dielectric oxide, interleaved spacers wound throughout the length of said foils in contact with an electrolyte consisting essentially of ethylene glycol as solvent, water, a phosphate ion source, and as solute mono(di-n-propylammonium) adipate or mono(diisopropylammonium) adipate, thereby providing a capacitor capable of operating at 200 VDC or higher and at 130° C., said electrolyte having a room-temperature resistivity of at least 700 Ω-cm.
Claim 2
Dependent Claim
82 words
A high-temperature aluminum electrolytic capacitor comprising two aluminum electrode foils, with one of said foils bearing a barrier layer dielectric oxide, interleaved spacers wound throughout the length of said foils in contact with an electrolyte consisting essentially of ethylene glycol as solvent, water, a phosphate ion source, and as solute mono(di-n-propylammonium) adipate or mono(diisopropylammonium) adipate, thereby providing a capacitor capable of operating at 200 VDC or higher and at 130° C., said electrolyte having a room-temperature resistivity of at least 700 Ω-cm.
Claim 3
Dependent Claim
31 words
A capacitor according to claim 1 wherein said electrolyte contains 65.3 wt% glycol, 0.5 wt% phosphate, 2.4 wt% water, and 31.8 wt% mono(di-n-propylammonium) adipate and said resistivity is about 785 Ω-cm.
Claim 4
Dependent Claim
33 words
A capacitor according to claim 1 wherein said electrolyte contains 88.40 wt% glycol, 5.32 wt% water, 0.3 wt% ammonium dihydrogen phosphate, and 5.98 wt% mono(di-n-propylammonium) adipate and said resistivity is about 1540 Ω-cm.
Claim 5
Dependent Claim
33 words
A capacitor according to claim 1 wherein said electrolyte contains 75.97 wt% glycol, 3.99 wt% water, 0.5 wt% ammonium dihydrogen phosphate, and 19.84 wt% mono(diisopropylammonium) adipate and said resistivity is about 930 Ω-cm.
References Cited (Backward Citations)
SU303662A1
Cited
US3293506A
Cited
CA839159A
Cited
US3835055A
Cited
US3812039A
Cited
GB2011182A
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 |