Patent US1801740A successfully refreshed from Google Patents.
US3945907A
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Electrolytic cell having rhenium coated cathodes
Assignee: BASF Corp
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Filing: 1974-09-16
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Granted: 1976-03-23
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Expires: 1994-09-16
Abstract
Abstract The use of composite cathodes comprising a metal substrate having thereon a coating of rhenium 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 10:20
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; C25B11/081; C25B11/091
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
In an electrolytic cell for the production of halogen and caustic or alkali metal hypohalides and chlorates from alkali metal halide solutions wherein the cell is equipped with anodes and cathodes, the improvement which comprises a composite cathode comprising a metal substrate having thereon a coating of rhenium.
Claim 2
Dependent Claim
48 words
In an electrolytic cell for the production of halogen and caustic or alkali metal hypohalides and chlorates from alkali metal halide solutions wherein the cell is equipped with anodes and cathodes, the improvement which comprises a composite cathode comprising a metal substrate having thereon a coating of rhenium.
Claim 3
Dependent Claim
16 words
The electrolytic cell of claim 1 wherein the coating is on one side of the cathode.
Claim 4
Dependent Claim
16 words
The electrolytic cell of claim 1 wherein the coating is on both sides of the cathode.
Claim 5
Dependent Claim
23 words
The electrolytic cell of claim 1 wherein there is a layer of nickel or cobalt intermediate said metal substrate and the rhenium coating.
Claim 6
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 7
Dependent Claim
16 words
The electrolytic cell of claim 4 wherein the rhenium coating is applied as two separate layers.
Claim 8
Dependent Claim
35 words
The electrolytic cell of claim 5 wherein the coating is rendered more durable by heat treating in a reducing gas after the application of the intermediate layer and again after the first layer of rhenium.
Claim 9
Dependent Claim
17 words
The electrolytic cell of claim 1 wherein the cathode is separated from the anode by a diaphragm.
Claim 10
Dependent Claim
17 words
The electrolytic cell of claim 1 wherein the cathode is separated from the anode by a membrane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |