US3975557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing an electrode
Assignee: Dow Chemical Co
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Filing: 1975-01-02
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Granted: 1976-08-17
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Expires: 1995-01-02
Abstract
Abstract A method of coating an electrode with an activating oxide comprising admixing an oxide particulate of titanium and ruthenium with a solution of titanium and ruthenium halides in an alcohol with a boiling temperature less than that of water, applying a layer of the mixture to a surface of a valve metal substrate, removing the liquid portion from the layer and then oxidizing the remaining portion of the layer.
Inventors
- 👤 Henry A. Kuchek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:42
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
159 words
A method for coating an electrode with an acitivating oxide comprising admixing an oxide particulate of titanium and ruthenium with a mixture consisting essentially by weight of from about 30 to about 70 percent of a titanium halide and from about 30 to about 70 weight percent of a ruthenium halide and an alcohol with a boiling temperature less than that of water; mechanically applying the oxide containing mixture to the surface of a valve metal substrate selected from the group consisting of tantalum, titanium and tungsten to coat at least a portion of the substrate with the oxide containing mixture; drying the coating; and exposing the coating to an elevated temperature for a sufficient time to oxide the titanium and ruthenium in the coating and to form in a single coating step an electrode suitable for use in the electrolytic production of chlorine and having an adherent oxide coating on at least a portion of the substrate surface.
Claim 2
Independent Claim
159 words
A method for coating an electrode with an acitivating oxide comprising admixing an oxide particulate of titanium and ruthenium with a mixture consisting essentially by weight of from about 30 to about 70 percent of a titanium halide and from about 30 to about 70 weight percent of a ruthenium halide and an alcohol with a boiling temperature less than that of water; mechanically applying the oxide containing mixture to the surface of a valve metal substrate selected from the group consisting of tantalum, titanium and tungsten to coat at least a portion of the substrate with the oxide containing mixture; drying the coating; and exposing the coating to an elevated temperature for a sufficient time to oxide the titanium and ruthenium in the coating and to form in a single coating step an electrode suitable for use in the electrolytic production of chlorine and having an adherent oxide coating on at least a portion of the substrate surface.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the valve metal is titanium.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein up to about 95 weight per cent of the oxide particulate is added to the halide containing mixture.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein the halides are chlorides.
Claim 6
Dependent Claim
12 words
The method of claim 13 wherein the titanium halide is titanium trichloride.
Claim 7
Dependent Claim
12 words
The method of claim 3 wherein the ruthenium halide is ruthenium trichloride.
Claim 8
Dependent Claim
24 words
The method of claim 2 wherein the oxide particulate is present in an amount of from about 70 to about 90 weight per cent.
Claim 9
Dependent Claim
18 words
The method of claim 2 wherein the coating is oxidized at a temperature of at least about 800°F.
Claim 10
Dependent Claim
21 words
The method of claim 2 wherein the coating is oxidized within the temperature range of from about 800° to about 1000°F.
Claim 11
Dependent Claim
21 words
The method of claim 2 wherein the coating is oxidized within the temperature range of from about 825° to about 875°F.
Claim 12
Dependent Claim
18 words
The method of claim 2 wherein drying is carried out at a temperature of up to about 250°F.
Claim 13
Dependent Claim
22 words
The method of claim 2 wherein the titanium surface to be coated is cleaned to remove surface contaminates before the coating step.
Claim 14
Dependent Claim
30 words
The method of claim 2 wherein the oxide containing mixture contains oxide particulates of titanium and ruthenium having a size of up to about 270 U.S. Standard Sieve Series Mesh.
References Cited (Backward Citations)
US3840443A
Cited
US3864163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |