US4121949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a cathode electrode for an electrolytic capacitor
Assignee: Duracell Inc USA
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Filing: 1977-01-06
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Granted: 1978-10-24
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Expires: 1997-01-06
Abstract
Abstract A cathode electrode of copper-based material adapted for use in an electrical device is provided with a layer composed of at least one compound from the group of copper selenide, copper telluride and copper sulfide by the reaction between the copper-based cathode electrode and an appropriate reactive compound of selenium, tellurium or sulfur. When utilized in an electrolytic capacitor, the layer on the cathode electrode helps to depolarize the capacitor and helps to increase the capacitance of the cathode electrode.
Inventors
- 👤 Charles W. Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:22
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/0425
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A method of coating a cathode electrode for an electrolytic capacitor, consisting of the steps of: providing a copper-based cathode electrode and forming a layer of a compound of copper on a surface of the cathode electrode by contacting the surface with an electrolyte containing at least one compound reactive with copper, the reactive compound being selected from the group consisting of tellurium dioxide and selenium dioxide whereby the layer of the compound of copper is formed from the group consisting of copper telluride and copper selenide respectively.
Claim 2
Independent Claim
88 words
A method of coating a cathode electrode for an electrolytic capacitor, consisting of the steps of: providing a copper-based cathode electrode and forming a layer of a compound of copper on a surface of the cathode electrode by contacting the surface with an electrolyte containing at least one compound reactive with copper, the reactive compound being selected from the group consisting of tellurium dioxide and selenium dioxide whereby the layer of the compound of copper is formed from the group consisting of copper telluride and copper selenide respectively.
Claim 3
Dependent Claim
21 words
The method as recited in claim 1 wherein the solution is tellurous acid formed by combining sulfuric acid and tellurium dioxide.
Claim 4
Dependent Claim
21 words
The method as recited in claim 1 wherein the solution is seleneous acid formed by combining sulfuric acid and selenium dioxide.
References Cited (Backward Citations)
US1308092A
Cited
US2710369A
Cited
US2871424A
Cited
US2871426A
Cited
US2937594A
Cited
US3243316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |