US4725927A
Expired / Lapsed
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Electric double layer capacitor
Assignee: Elna Co Ltd
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Filing: 1987-04-08
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Granted: 1988-02-16
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Expires: 2007-04-08
Abstract
Abstract An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises a solute dissolved in at least one solvent selected from the group consisting of sulfolane and a derivative thereof.
Inventors
- 👤 Takeshi Morimoto
- 👤 Kazuya Hiratsuka
- 👤 Yasuhiro Sanada
- 👤 Hiroshi Aruga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:21
CPC Classifications
H; H01; H01G; H01G11/00; H01G11/54; H01G11/58; H01G11/60; H01G11/62; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises a solute dissolved in at least one solvent selected from the group consisting of sulfolane and a derivative thereof.
Claim 2
Dependent Claim
45 words
An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises a solute dissolved in at least one solvent selected from the group consisting of sulfolane and a derivative thereof.
Claim 3
Dependent Claim
15 words
The capacitor according to claim 1, wherein the derivative of sulfolane is 3-methylsulfolane or 2,4-dimethylsulfolane.
Claim 4
Dependent Claim
55 words
An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises an electrolyte dissolved in a solvent mixture comprising propylene carbonate or butylene carbonate and at least one solvent selected from the group consisting of sulfolane and a derivative thereof.
Claim 5
Dependent Claim
55 words
An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises an electrolyte dissolved in a solvent mixture comprising propylene carbonate or butylene carbonate and at least one solvent selected from the group consisting of sulfolane and a derivative thereof.
Claim 6
Dependent Claim
20 words
A capacitor according to claim 3, wherein the solvent mixture contains from 10 to 80% by volume of propylene carbonate.
Claim 7
Dependent Claim
20 words
The capacitor according to claim 3, wherein the solvent mixture contains from 10 to 80% by volume of butylene carbonate.
Claim 8
Dependent Claim
39 words
The capacitor according to claim 3, wherein the electrolyte is a salt formed by the combination of a cation of tetraalkylphosphonium or tetraalkylammonium with an anion of tetrafluoroboric acid, hexafluorophosphoric acid, hexafluoroarsenic acid, perchloric acid or trifluoromethane sulfonic acid.
Claim 9
Dependent Claim
51 words
An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises an electrolyte dissolved in a solvent mixture comprising chlorobenzene and at least one solvent selected from the group consisting of sulfolane and a derivative thereof.
Claim 10
Dependent Claim
51 words
An electric double layer capacitor utilizing an electric double layer formed by the interface of an electrolyte solution and polarizable electrodes, wherein the electrolyte solution comprises an electrolyte dissolved in a solvent mixture comprising chlorobenzene and at least one solvent selected from the group consisting of sulfolane and a derivative thereof.
Claim 11
Dependent Claim
19 words
The capacitor according to claim 7, wherein the solvent mixture contains from 10 to 70% by volume of chlorobenzene.
Claim 12
Dependent Claim
39 words
The capacitor according to claim 7, wherein the electrolyte is a salt formed by the combination of a cation of tetraalkylphosphonium or tetraalkylammonium with an anion of tetrafluoroboric acid, hexafluorophosphoric acid, hexafluoroarsenic acid, perchloric acid or trifluoromethane sulfonic acid.
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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |