US4208450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transition metal oxide electrodes
Assignee: ELECTRODE Corp A CORP OF
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Filing: 1978-09-18
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Granted: 1980-06-17
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Expires: 1998-09-18
Abstract
Abstract Disclosed is an electrode for use in electrochemical processes wherein a metal substrate made of a valve metal such as titanium carries a semi-conducting intermediate coating consisting of a combination of tin and antimony oxides laid down upon the valve metal substrate in a series of layers and a top coating consisting of an oxide selected from the group of chromium, manganese, iron, cobalt, nickel, molybdenum or tungsten applied in a series of layers.
Inventors
- 👤 David L. Lewis
- 👤 Barry A. Schenker
- 👤 Mary R. Suchanski
- 👤 C. Richard Franks, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:16
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A method for manufacture of an electrode for use in an electrolytic cell comprising the steps of: selecting a valve metal substrate from the group of aluminum, molybdenum, niobium, tantalum, titanium, tungsten, zirconium or alloys thereof; applying to said valve metal substrate a semi-conductive intermediate coating of thermally decomposable compounds of tin and antimony containing 0.1 to 30 weight percent antimony, drying said semi-conductive intermediate coating; baking said semi-conductive intermediate coating in an oxidizing atmosphere at an elevated temperature to transform the tin and antimony compounds to their respective oxides such that said semi-conductive intermediate coating attains a weight greater than 2 grams per square meter of said valve metal substrate surface area; and applying on the surface of said semi-conductive intermediate coating a top coating consisting of oxides of transition metals selected from the group consisting of chromium, iron, cobalt, nickel, molybdenum or tungsten such that said topcoating attains a weight greater than 25 grams per square meter of said valve metal substrate surface area.
Claim 2
Independent Claim
166 words
A method for manufacture of an electrode for use in an electrolytic cell comprising the steps of: selecting a valve metal substrate from the group of aluminum, molybdenum, niobium, tantalum, titanium, tungsten, zirconium or alloys thereof; applying to said valve metal substrate a semi-conductive intermediate coating of thermally decomposable compounds of tin and antimony containing 0.1 to 30 weight percent antimony, drying said semi-conductive intermediate coating; baking said semi-conductive intermediate coating in an oxidizing atmosphere at an elevated temperature to transform the tin and antimony compounds to their respective oxides such that said semi-conductive intermediate coating attains a weight greater than 2 grams per square meter of said valve metal substrate surface area; and applying on the surface of said semi-conductive intermediate coating a top coating consisting of oxides of transition metals selected from the group consisting of chromium, iron, cobalt, nickel, molybdenum or tungsten such that said topcoating attains a weight greater than 25 grams per square meter of said valve metal substrate surface area.
Claim 3
Dependent Claim
39 words
A method according to claim 1 wherein said semi-conductive intermediate coating is applied in a series of layers, each being dried before subsequent application of the next layer, and being baked at the conclusion thereof to their respective oxides.
Claim 4
Dependent Claim
30 words
A method according to claim 1 wherein the top coating is applied by painting a transition metal nitrate in a series of layers, dried, and baked to its oxide form.
Claim 5
Dependent Claim
33 words
A method according to claim 1 wherein the top coating of a oxide of a transition metal is applied by electroplating a transition metal oxide upon the surface of the semi-conductive intermediate coating.
Claim 6
Dependent Claim
61 words
A method according to claim 1 wherein the top coating is applied by electroplating in a bath containing a transition metal sulfate; drying the layer at room temperature; painting a solution containing the transition metal nitrate over the electroplated layer; baking the top coating to transform the transition metal to its oxide form; and repeating this process two to six times.
Claim 7
Dependent Claim
31 words
A method according to claim 1 wherein porous titanium is selected, and the method for applying the semi-conductive intermediate coating is by sucking a solution through the substrate using a vacuum.
Claim 8
Dependent Claim
49 words
A method according to claim 6 wherein the method for applying the top coating of the oxide of a transition metal is by sucking a transition metal nitrate solution through the substrate using a vacuum and baking the top coating to transform the transition metal to its oxide form.
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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) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |