US3974058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ruthenium coated cathodes
Assignee: BASF Corp
•
Filing: 1974-09-16
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Granted: 1976-08-10
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Expires: 1994-09-16
Abstract
Abstract Composite cathodes comprising a metal substrate having thereon an intermediate coating of cobalt and an overcoating of ruthenium for use in electrolytic cells for the electrolysis of aqueous alkali metal halide solutions reduces the cell voltage requirements in comparison to the conventional ferrous metal cathodes traditionally used in such cells.
Inventors
- 👤 Sudarshan D. Gokhale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:45
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
In an electrolytic cell for the production of halogen and caustic from alkali metal halide solutions wherein the cell is equipped with anodes, cathodes, and means separating said anodes from said cathodes, the improvement which comprises a composite cathode comprising a metal substrate having thereon an intermediate coating of cobalt and an overcoating of ruthenium.
Claim 2
Dependent Claim
55 words
In an electrolytic cell for the production of halogen and caustic from alkali metal halide solutions wherein the cell is equipped with anodes, cathodes, and means separating said anodes from said cathodes, the improvement which comprises a composite cathode comprising a metal substrate having thereon an intermediate coating of cobalt and an overcoating of ruthenium.
Claim 3
Dependent Claim
16 words
The electrolytic cell of claim 1 wherein the coatings are on one side of the cathode.
Claim 4
Dependent Claim
16 words
The electrolytic cell of claim 1 wherein the coatings are on both sides of the cathode.
Claim 5
Dependent Claim
34 words
The electrolytic cell of claim 1 wherein there is a secondary coating between the intermediate coating of cobalt and the said metal substrate selected from the group consisting of nickel, platinum, palladium and rhodium.
Claim 6
Dependent Claim
12 words
The electrolytic cell of claim 4 wherein the secondary coating is nickel.
Claim 7
Dependent Claim
16 words
The electrolytic cell of claim 4 wherein the ruthenium coating is applied as two separate layers.
Claim 8
Dependent Claim
23 words
The electrolytic cell of claim 6 wherein the cathode is heat treated before and after the deposition of the first layer of ruthenium.
Claim 9
Dependent Claim
21 words
The electrolytic cell of claim 4 wherein the intermediate layer has a nonuniform thickness so as to increase the surface area.
Claim 10
Dependent Claim
19 words
The electrolytic cell of claim 1 wherein said means for separating said anodes from said cathode is a diaphragm.
Claim 11
Dependent Claim
19 words
The electrolytic cell of claim 1 wherein said means for separating said anode from said cathode is a membrane.
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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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |