US4140813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making long-term electrode for electrolytic processes
Assignee: Hoechst AG
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Filing: 1977-08-30
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Granted: 1979-02-20
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Expires: 1997-08-30
Abstract
Abstract A long-term electrode for electrolytic processes comprises a skeleton of a metal passive under the conditions of the electrolytic process and an electrically conductive first coating which is bound to the metal skeleton in a tightly adhesive manner covering at least part of the metal surface and to which is applied electrochemically active substances selected from the group of platinum metals and platinum metal compounds.
Inventors
- 👤 Helmut Hund
- 👤 Helmut Schaefer
- 👤 Dieter Bergner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:47
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
In a process for the preparation of an electrode for conducting and withstanding relatively high current densities in electrolytic processes, which comprises producing a first coating of titanium oxide on the surface of a metal passive under the conditions of the electrolytic process, applying a solution or suspension containing a platinum metal compound to the first coating and converting said solution or suspension subsequently by heat treatment into an electrochemically active substance containing a platinum metal or oxide thereof, the improvement comprising producing an electrically conductive first coating of said titanium oxide in the amount of from 50 to 6000 g/m 2 by flame or plasma spraying the titanium oxide onto the surface of said metal.
Claim 2
Dependent Claim
116 words
In a process for the preparation of an electrode for conducting and withstanding relatively high current densities in electrolytic processes, which comprises producing a first coating of titanium oxide on the surface of a metal passive under the conditions of the electrolytic process, applying a solution or suspension containing a platinum metal compound to the first coating and converting said solution or suspension subsequently by heat treatment into an electrochemically active substance containing a platinum metal or oxide thereof, the improvement comprising producing an electrically conductive first coating of said titanium oxide in the amount of from 50 to 6000 g/m 2 by flame or plasma spraying the titanium oxide onto the surface of said metal.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein the passive metal, when used as an anode, is resistant under the conditions of aqueous alkali chloride electrolysis.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 2, wherein the passive metal consists of a metal of the group IVB to VIB of the Periodic System.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 3, wherein the passive metal consists of an alloy containing at least one metal of the group IVB to VIB of the Periodic System.
Claim 6
Dependent Claim
14 words
A process as claimed in claim 3, wherein the passive metal consists of titanium.
Claim 7
Dependent Claim
16 words
A process as claimed in claim 3, wherein the passive metal consists of a titanium alloy.
Claim 8
Dependent Claim
33 words
A process as claimed in claim 1, which comprises producing the first coating of titanium oxide in an amount of from 100 to 2000 g/m 2 on the surface of the passive metal.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 1, wherein the first coating of titanium oxide corresponds to the empirical formula TiO y having 1.999≦y≦0.1.
Claim 10
Dependent Claim
11 words
A process as claimed in claim 8, wherein y is ≧1.75.
Claim 11
Dependent Claim
11 words
A process as claimed in claim 9, wherein y is ≧1.90.
Claim 12
Dependent Claim
25 words
A process as claimed in claim 9, wherein the first coating of titanium oxide has a rutile structure or a crystal structure similar to rutile.
Claim 13
Dependent Claim
19 words
A process as claimed in claim 1, wherein ruthenium dioxide and/or iridium dioxide are used as electrochemically active substance.
Claim 14
Dependent Claim
37 words
A process as claimed in claim 1, wherein the content of platinum metals or platinum metal oxides, calculated as platinum metal, is from 1 to 100 g/m 2 , preferably from 5 to 50 g/m 2 .
Claim 15
Dependent Claim
21 words
A process as claimed in claim 1, wherein the solution or suspension applied to the first coating contains also titanium compounds.
References Cited (Backward Citations)
US3318730A
Cited
US3632498A
Cited
US3663280A
Cited
US3562008A
Cited
US3657102A
Cited
US3491014A
Cited
US3773555A
Cited
US3711385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |