US4159509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode depolarizer
Assignee: Duracell Inc USA
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Filing: 1977-06-06
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Granted: 1979-06-26
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Expires: 1997-06-06
Abstract
Abstract An electrical device stabilized for long life operation comprising a cathode electrode including a porous layer of electrically conductive metal containing material, an electrolyte including an inorganic acid contacting the cathode electrode, and a cathode depolarizer including copper salt. A method of depolarizing an electrical device comprising the steps of forming a cathode electrode of layers of materials including a porous layer of electrically conductive metal containing material, contacting the cathode electrode with an electrolyte including an inorganic acid and a depolarizer including copper salt, reducing the copper salt to copper, and depositing copper on the cathode electrode as copper metal.
Inventors
- 👤 Charles W. Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:46
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/04; H01G9/042; H01G9/0425
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
53 words
An electrical device stabilized for long life operation comprising a cathode electrode including a porous layer of electrically conductive metal containing material, an electrolyte including an inorganic acid contacting the cathode electrode, and a cathode depolarizer including copper ions reducible to copper metal by current flow prior to reduction of the inorganic acid.
Claim 2
Dependent Claim
53 words
An electrical device stabilized for long life operation comprising a cathode electrode including a porous layer of electrically conductive metal containing material, an electrolyte including an inorganic acid contacting the cathode electrode, and a cathode depolarizer including copper ions reducible to copper metal by current flow prior to reduction of the inorganic acid.
Claim 3
Dependent Claim
29 words
The electrical device of claim 1, wherein the porous layer of electrically conductive metal containing material is selected from the group consisting of platinum, palladium, gold, ruthenium and rhodium.
Claim 4
Dependent Claim
21 words
The electrical device of claim 2, wherein the cathode depolarizer is about 0.1 wt.% to about 5 wt.% of the electrolyte.
Claim 5
Dependent Claim
14 words
The electrical device of claim 3, wherein the cathode depolarizer includes a copper salt.
Claim 6
Dependent Claim
30 words
The electrical device of claim 4, wherein the electrical device is an electrolytic capacitor with an electrolyte containing H 2 SO 4 and a dielectric oxide film-forming metal porous anode.
Claim 7
Dependent Claim
16 words
The electrical device of claim 4, wherein said copper salt is CuSO 4 .5H 2 O.
Claim 8
Dependent Claim
21 words
The electrical device of claim 1, wherein the cathode electrode contains about 90 wt. % to about 100 wt. % silver.
Claim 9
Dependent Claim
16 words
The electrical device of claim 1, wherein the porous layer of electrically conductive metal comprises platinum.
Claim 10
Dependent Claim
23 words
The electrical device of claim 2, wherein the cathode depolarizer is about 2 wt. % to about 4 wt. % of the electrolyte.
Claim 11
Independent Claim
56 words
A method for improving the depolarizing of an electrical device having a silver-based cathode electrode with a porous layer of electrically conductive metal containing material thereon comprising the steps of contacting the silver-based cathode electrode with an electrolyte including an inorganic acid and a depolarizer having copper ions, and depositing copper on the silver-based cathode electrode.
Claim 12
Independent Claim
56 words
A method for improving the depolarizing of an electrical device having a silver-based cathode electrode with a porous layer of electrically conductive metal containing material thereon comprising the steps of contacting the silver-based cathode electrode with an electrolyte including an inorganic acid and a depolarizer having copper ions, and depositing copper on the silver-based cathode electrode.
Claim 13
Dependent Claim
18 words
The method of claim 10 wherein the silver-based cathode electrode contains about 90 to 100 weight % silver.
Claim 14
Dependent Claim
12 words
The method of claim 10 wherein the depolarizer includes a copper salt.
Claim 15
Dependent Claim
33 words
The method of claim 12, including the further step of dissolving copper metal as copper ions from the cathode after deposition as a result of a reversal of the direction of current flow.
Claim 16
Dependent Claim
21 words
The method of claim 13, wherein the deposit of copper metal is adherent to the cathode electrode and is structurally sound.
References Cited (Backward Citations)
US2710369A
Cited
US3751797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |