US4438481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double layer capacitor
Assignee: United Chemi Con Inc
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Filing: 1982-09-30
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Granted: 1984-03-20
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Expires: 2002-09-30
Abstract
Abstract An electrical capacitor is described which comprises a housing, a pair of electrodes in said housing, one of said electrodes being composed of a mixture of carbon particles and an electrolyte and the other electrode being composed of a mixture of lead metal and the same electrolyte, and an ionically conductive separator means between and in contact with said pair of electrodes, electronically separating said electrodes from each other, wherein the electrolyte comprises an acidic solution of soluble sulfate salts.
Inventors
- 👤 Jeffrey Phillips
- 👤 Hiroshi Takei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:34
CPC Classifications
H; H01; H01G; H01G11/00; H01G11/04; H01G11/22; H01G11/30; H01G11/54; H01G11/58; H01G11/62; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
An electrical capacitor comprising a housing, a pair of electrodes in said housing, one of said electrodes being composed of a mixture of carbon particles and an electrolyte and the other electrode being composed of a mixture of lead metal and the same electrolyte, and an ionically conductive separator means between and in contact with said pair of electrodes, electronically separating said electrodes from each other, wherein the electrolyte comprises a solution of soluble sulfate salts of concentration in the range from 0.5 to 5 molar at an acid pH preferably not greater than 2.
Claim 2
Dependent Claim
95 words
An electrical capacitor comprising a housing, a pair of electrodes in said housing, one of said electrodes being composed of a mixture of carbon particles and an electrolyte and the other electrode being composed of a mixture of lead metal and the same electrolyte, and an ionically conductive separator means between and in contact with said pair of electrodes, electronically separating said electrodes from each other, wherein the electrolyte comprises a solution of soluble sulfate salts of concentration in the range from 0.5 to 5 molar at an acid pH preferably not greater than 2.
Claim 3
Dependent Claim
18 words
An electrical capacitor according to claim 1 wherein the electrolyte is composed of ammonium sulfate and sulfuric acid.
Claim 4
Dependent Claim
21 words
An electrical capacitor according to claim 2 wherein the pH of the electrolyte is in the range from 0.3 to 1.
Claim 5
Dependent Claim
25 words
An electrical capacitor according to claim 3 wherein the concentration of ammonium sulfate in the electrolyte is in the range from 0.5 to 5 molar.
References Cited (Backward Citations)
US2749487A
Cited
US3648126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |