US4734821A
Expired / Lapsed
US
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Electrolytic capacitor
Assignee: Elna Co Ltd
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Filing: 1987-05-13
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Granted: 1988-03-29
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Expires: 2007-05-13
Abstract
Abstract An electrolytic capacitor comprising a capacitor element and an electrolyte impregnated to the element, wherein the electrolyte comprises an organic polar solvent and a solute dissolved in the solvent, said solute being selected from the group consisting of a quaternary ammonium salt of an aromatic carboxylic acid, a quaternary ammonium salt of cycloalkene carboxylic acid and a quaternary ammonium salt of an unsaturated aliphatic carboxylic acid.
Inventors
- 👤 Takeshi Morimoto
- 👤 Yoshiki Hamatani
- 👤 Toshiya Matsubara
- 👤 Naoto Iwano
- 👤 Hideo Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:22
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
66 words
An electrolytic capacitor comprising a capacitor element and an electrolyte impregnated to the element, wherein the electrolyte comprises an organic polar solvent and a solute dissolved in the solvent, said solute being selected from the group consisting of a quaternary ammonium salt of an aromatic carboxylic acid, a quaternary ammonium salt of cycloalkene carboxylic acid and a quaternary ammonium salt of an unsaturated aliphatic carboxylic acid.
Claim 2
Dependent Claim
66 words
An electrolytic capacitor comprising a capacitor element and an electrolyte impregnated to the element, wherein the electrolyte comprises an organic polar solvent and a solute dissolved in the solvent, said solute being selected from the group consisting of a quaternary ammonium salt of an aromatic carboxylic acid, a quaternary ammonium salt of cycloalkene carboxylic acid and a quaternary ammonium salt of an unsaturated aliphatic carboxylic acid.
Claim 3
Dependent Claim
21 words
The electrolytic capacitor according to claim 1, wherein the aromatic carboxylic acid is an aromatic monobasic, dibasic, tribasic or tetrabasic acid.
Claim 4
Dependent Claim
18 words
The electrolytic capacitor according to claim 2, wherein the aromatic carboxylic acid is phthalic acid or benzoic acid.
Claim 5
Dependent Claim
14 words
The electrolytic capacitor according to claim 3, wherein the phthalic acid is o-phthalic acid.
Claim 6
Dependent Claim
24 words
The electrolytic capacitor according to claim 2, wherein the quaternary ammonium salt of the aromatic dibasic, tribasic or tetrabasic acid is an acidic salt.
Claim 7
Dependent Claim
15 words
The electrolytic capacitor according to claim 1, wherein the cycloalkene carboxylic acid is tetrahydrophthalic acid.
Claim 8
Dependent Claim
19 words
The electrolytic capacitor according to claim 6, wherein the quaternary ammonium salt of tetrahydrophthalic acid is an acidic salt.
Claim 9
Dependent Claim
24 words
The electrolytic capacitor according to claim 1, wherein the unsaturated aliphatic carboxylic acid has from 2 to 12 carbon atoms in the aliphatic moiety.
Claim 10
Dependent Claim
19 words
The electrolytic capacitor according to claim 8, wherein the unsaturated aliphatic carboxylic acid is an unsaturated aliphatic dibasic acid.
Claim 11
Dependent Claim
22 words
The electrolytic capacitor according to claim 9, wherein the quaternary ammonium salt of the unsaturated aliphatic dibasic acid is an acidic salt.
Claim 12
Dependent Claim
17 words
The electrolytic capacitor according to claim 9, wherein the unsaturated aliphatic dibasic carboxylic acid is maleic acid.
Claim 13
Dependent Claim
27 words
The electrolytic capacitor according to claim 1, wherein the solute is present in an ammount of from 1 to 50% by weight in the organic polar solvent.
Claim 14
Dependent Claim
32 words
The electrolytic capacitor according to claim 1, wherein the quaternary ammonium group is represented by R 4 N + wherein R is an alkyl group having from 1 to 10 carbon atoms.
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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |