US4605989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodes for double layer capacitors
Assignee: SOHIO CLEVELAND OHIO A CORP OF OHIO
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Filing: 1985-08-12
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Granted: 1986-08-12
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Expires: 2005-08-12
Abstract
Abstract In double layer capacitors having carbon electrodes, the electrodes contain at least 1%, by weight, of an inert particulate material to reduce the leakage current of the capacitor. The inert particulate material is selected from the group comprising SiO 2 , Al 2 O 3 , SiC and aluminum silicates.
Inventors
- 👤 Allen V. Marse
- 👤 Phil D. Bennett
- 👤 Donald L. Boos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:33
CPC Classifications
H; H01; H01G; H01G11/00; H01G11/22; H01G11/30; H01G11/32; H01G11/38; H01G11/52; H01G11/54; H01G11/56; H01G11/58; H01G11/64; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 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, the improvement comprising providing in said electrodes at least 1%, by weight, of an inert particulate material selected from the group consisting of SiO 2 , Al 2 O 3 , SiC and aluminum silicates to reduce the leakage current of said capacitor.
Claim 2
Dependent Claim
85 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, the improvement comprising providing in said electrodes at least 1%, by weight, of an inert particulate material selected from the group consisting of SiO 2 , Al 2 O 3 , SiC and aluminum silicates to reduce the leakage current of said capacitor.
Claim 3
Dependent Claim
19 words
The double layer capacitor of claim 1 wherein the inert particulate material in said electrodes is SiO 2 .
Claim 4
Dependent Claim
23 words
The double layer capacitor of claim 2 wherein SiO 2 is present in an amount from about 3% to about 6%, by weight.
Claim 5
Dependent Claim
52 words
An electrode material capable of conferring a low leakage current characteristic on a double layer capacitor comprising as a major constituent an electroloyte and at least 1%, by weight, of an inert particulate material selected from the group consisting of SiO 2 , Al 2 O 3 , SiC and aluminum silicates.
Claim 6
Dependent Claim
52 words
An electrode material capable of conferring a low leakage current characteristic on a double layer capacitor comprising as a major constituent an electroloyte and at least 1%, by weight, of an inert particulate material selected from the group consisting of SiO 2 , Al 2 O 3 , SiC and aluminum silicates.
Claim 7
Dependent Claim
15 words
The electrode material of claim 4 wherein the inert particulate material is SiO 2 .
Claim 8
Dependent Claim
24 words
The electrode material of claim 5 wherein the SiO 2 is present in an amount of from about 3% to about 6%, by weight.
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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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |