US4622611A
Expired / Lapsed
US
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Double layer capacitors
Assignee: SOHIO A CORP OF OH
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Filing: 1985-04-02
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Granted: 1986-11-11
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Expires: 2005-04-02
Abstract
Abstract Double layer capacitors incorporate electrolytes having relatively high pH whereby reduced leakage current is attained as well as greatly extended back-up times.
Inventors
- 👤 Phillip D. Bennett
- 👤 John C. Currie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:54
CPC Classifications
H; H01; H01G; H01G4/00; H01G11/00; H01G11/22; H01G11/24; H01G11/30; H01G11/32; H01G11/54; H01G11/58; H01G11/62; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
57 words
A double layer capacitor comprising a first and second electrode, said electrodes comprising a high surface area carbon constituent and an electrolyte, and an ionically conductive separator means between and in contact with said electrodes electronically separating said electrodes from each other, said electrolyte having a pH above about 2 whereby the capacitor exhibits low leakage current.
Claim 2
Dependent Claim
57 words
A double layer capacitor comprising a first and second electrode, said electrodes comprising a high surface area carbon constituent and an electrolyte, and an ionically conductive separator means between and in contact with said electrodes electronically separating said electrodes from each other, said electrolyte having a pH above about 2 whereby the capacitor exhibits low leakage current.
Claim 3
Dependent Claim
27 words
The electrolytic capacitor of claim 1 wherein the high surface area carbon of which the electrodes are composed has a surface area of 100-2000 meters 2 /g.
Claim 4
Dependent Claim
30 words
The electrolytic capacitor of claim 2 wherein the electrolyte is composed of an aqueous solution based on one or more salts from the group consisting of sulfates, phosphates and chlorides.
Claim 5
Dependent Claim
19 words
The electrolytic capacitor of claim 3 wherein the high surface area carbon of the electrode is an activated carbon.
Claim 6
Dependent Claim
19 words
The electrolytic capacitor of claim 4 wherein the high surface area carbon of the electrode is a carbon cloth.
Claim 7
Dependent Claim
68 words
The electrolytic capacitor of claim 2 wherein the electrolyte is composed of an aqueous solution comprising a compound selected from the group consisting of K 2 SO 4 , (NH 4 ) 2 SO 4 , Li 2 SO 4 .H 2 O, Na 2 SO 4 , K 2 HPO 4 , (NH 4 ) 2 HPO 4 , Na 2 HPO 4 and CaCl 2 .
Claim 8
Dependent Claim
21 words
The double layer capacitor of claim 3 wherein the electrolyte is a neutral aqueous solution of K 2 SO 4 .
Claim 9
Dependent Claim
91 words
A double layer capacitor comprising a positive and a negative electrode, said electrodes comprising a high surface area carbon constituent having a surface area of 100-2,000 meters 2 /g and an electrolyte which is an aqueous solution having a pH greater than 3.5 comprising about 100 grams of K 2 SO 4 and less than 1 gram of KHSO 4 per liter of solution, and an ionically conductive separator means between and in contact with said electrodes electronically separating said electrodes from each other, said capacitor exhibiting a low leakage current.
Claim 10
Dependent Claim
91 words
A double layer capacitor comprising a positive and a negative electrode, said electrodes comprising a high surface area carbon constituent having a surface area of 100-2,000 meters 2 /g and an electrolyte which is an aqueous solution having a pH greater than 3.5 comprising about 100 grams of K 2 SO 4 and less than 1 gram of KHSO 4 per liter of solution, and an ionically conductive separator means between and in contact with said electrodes electronically separating said electrodes from each other, said capacitor exhibiting a low leakage current.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |