US3628103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for wet electrolyte capacitors
Assignee: Duracell Inc USA
•
Filing: 1969-04-28
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Granted: 1971-12-14
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Expires: 1989-04-28
Abstract
Abstract In an electrolytic capacitor, a layer of gold, platinum or gold platinum alloy constitutes the cathode, thereby permitting the capacitor to withstand reversals of polarity. Finely divided material such as carbon or platinum may be applied to the surface of the layer to increase the effective surface area of the cathode.
Inventors
- 👤 James M Booe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:15
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/04; H01G9/042; H01G9/0425
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
22 words
A capacitor according to claim 1 in which substantially none of said second electrode is chemically or anodically dissolved in said electrolyte.
Claim 2
Dependent Claim
25 words
A capacitor according to claim 1 in which a finely divided material having chemical and electrochemical resistance to the electrolyte is applied to said layer.
Claim 3
Dependent Claim
33 words
A capacitor according to claim 3 in which said material is selected from the group consisting of finely divided platinum, finely divided gold, finely divided gold-platinum alloys, finely divided carbon and mixtures thereof.
Claim 4
Dependent Claim
13 words
A capacitor according to claim 1 in which a nonhalide electrolyte is used.
Claim 5
Dependent Claim
14 words
A capacitor according to claim 1 in which said electrolyte is sulfuric acid solution.
Claim 6
Dependent Claim
19 words
A capacitor according to claim 1 in which said support and said layer are formed as a bimetal composite.
Claim 7
Dependent Claim
17 words
A capacitor according to claim 7 in which said support and said layer are readily coformed mechanically.
Claim 8
Dependent Claim
18 words
A capacitor according to claim 1 in which said layer is from about 0.0001 to 0.005 inches thick.
References Cited (Backward Citations)
US3082360A
Cited
US2923866A
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US2871425A
Cited
US2871426A
Cited
US3056072A
Cited
US3243316A
Cited
US3461355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |