US4473864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic capacitor
Assignee: US Philips Corp
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Filing: 1983-09-01
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Granted: 1984-09-25
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Expires: 2003-09-01
Abstract
Abstract An electrolytic capacitor for use in the range from -55 to +125° C. with an liquid electrolyte consisting of a salt of a quaternary ammonium base and a dibasic organic acid, preferably having 6 to 10 carbon atoms dissolved in a dipolar organic solvent with 2-10% by weight of water. The liquid gives the capacitor an excellent forming behavior. High voltage and low voltage constructions of the capacitor are possible.
Inventors
- 👤 Tineke Van Heusden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:46
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
87 words
An electrolytic capacitor comprising an anode provided with a dielectric oxide layer by anodic oxidation, a cathode, a spacer and a liquid electrolyte comprising a salt of a substituted ammonium base and an organic acid in a dipolar organic solvent, characterized in that the electrolyte comprises a salt of a quaternary ammonium base and a dibasic organic carboxylic acid HOOC--(CH 2 ) n --COOH wherein 4≦N≦8 dissolved in a mixture of a dipolar organic solvent and at least 2% but at most 10% by weight of water.
Claim 2
Dependent Claim
87 words
An electrolytic capacitor comprising an anode provided with a dielectric oxide layer by anodic oxidation, a cathode, a spacer and a liquid electrolyte comprising a salt of a substituted ammonium base and an organic acid in a dipolar organic solvent, characterized in that the electrolyte comprises a salt of a quaternary ammonium base and a dibasic organic carboxylic acid HOOC--(CH 2 ) n --COOH wherein 4≦N≦8 dissolved in a mixture of a dipolar organic solvent and at least 2% but at most 10% by weight of water.
Claim 3
Dependent Claim
29 words
A capacitor as claimed in claim 1, characterized in that the dissolved salt in the liquid electrolyte comprises the base and the acid in the stoichiometric mol. ratio 2:1.
Claim 4
Dependent Claim
25 words
A capacitor as claimed in claim 2, characterized in that the liquid electrolyte comprises at least 2, but at most 4% by weight of water.
Claim 5
Dependent Claim
16 words
A capacitor as claimed in claim 2, characterized in that the liquid electrolyte comprises boric acid.
Claim 6
Dependent Claim
17 words
A capacitor as claimed in claim 2, characterized in that the liquid electrolyte comprises a dissolved phosphate.
Claim 7
Dependent Claim
25 words
A capacitor as claimed in claim 1, characterized in that the liquid electrolyte comprises at least 2, but at most 4% by weight of water.
Claim 8
Dependent Claim
16 words
A capacitor as claimed in claim 1, characterized in that the liquid electrolyte comprises boric acid.
Claim 9
Dependent Claim
17 words
A capacitor as claimed in claim 1, characterized in that the liquid electrolyte comprises a dissolved phosphate.
Claim 10
Dependent Claim
16 words
A capacitor as claimed in claim 1, characterized in that the spacer consists of Manilla paper.
Claim 11
Dependent Claim
30 words
A capacitor as claimed in claim 1, characterized in that the solvent in the liquid electrolyte consists of a mixture of N-dimethyl-acetamide and N-monomethylacetamide in a mol. ratio of 4:1.
Claim 12
Dependent Claim
30 words
A capacitor as claimed in claim 1, characterized in that the dissolved salt in the liquid electrolyte comprises the base and the acid in the stoichiometric mol. ratio of 2:1.
Claim 13
Dependent Claim
25 words
A capacitor as claimed in claim 1, characterized in that the liquid electrolyte comprises at least 2, but at most 4% by weight of water.
Claim 14
Dependent Claim
16 words
A capacitor as claimed in claim 1, characterized in that the liquid electrolyte comprises boric acid.
Claim 15
Dependent Claim
17 words
A capacitor as claimed in claim 1, characterized in that the liquid electrolyte comprises a dissolved phosphate.
Claim 16
Dependent Claim
16 words
A capacitor as claimed in claim 1, characterized in that the spacer consists of Manilla paper.
Claim 17
Dependent Claim
30 words
A capacitor as claimed in claim 1, characterized in that the solvent in the liquid electrolyte consists of a mixture of N-dimethyl-acetamide and N-monomethylacetamide in a mol. ratio of 4:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |