US4005004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode coating consisting of a solid solution of a noble metal oxide, titanium oxide, and zirconium oxide
Assignee: Asahi Kasei Corp
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Filing: 1975-09-10
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Granted: 1977-01-25
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Expires: 1995-09-10
Abstract
Abstract A solid solution of a noble metal oxide, titanium oxide and zirconium oxide, containing 1 to 50 mol % of titanium oxide and zirconium oxide as the total content, is coated on an anti-corrosive substrate, e.g. titanium metal to give an electrode which is excellent in low oxygen content in chlorine gas, low electrode consumption and low chlorine overvoltage when it is used as anode for electrolysis of an aqueous sodium chloride solution.
Inventors
- 👤 Maomi Seko
- 👤 Shinsaku Ogawa
- 👤 Mitsuo Yoshida
- 👤 Akira Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:49
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
62 words
An electrode comprising an anti-corrosive conductor having a coating of a solid solution containing at least one noble metal oxide together with titanium oxide and zirconium oxide, the total amount of titanium oxide plus zirconium oxide being from 1 to 50 %; said total amount containing from 0.5 to 49.5 mol % titanium dioxide and 0.5 to 49.5 mol % zirconium oxide.
Claim 2
Dependent Claim
62 words
An electrode comprising an anti-corrosive conductor having a coating of a solid solution containing at least one noble metal oxide together with titanium oxide and zirconium oxide, the total amount of titanium oxide plus zirconium oxide being from 1 to 50 %; said total amount containing from 0.5 to 49.5 mol % titanium dioxide and 0.5 to 49.5 mol % zirconium oxide.
Claim 3
Dependent Claim
15 words
An electrode as claimed in claim 1, wherein the noble metal oxide is ruthenium oxide.
Claim 4
Dependent Claim
21 words
An electrode as claimed in claim 1, wherein the noble metal oxide is a mixture of ruthenium oxide and platinum oxide.
Claim 5
Dependent Claim
21 words
An electrode as claimed in claim 1, wherein the noble metal oxide is a mixture of ruthenium oxide and palladium oxide.
Claim 6
Dependent Claim
21 words
An electrode as claimed in claim 1, wherein the noble metal oxide is a mixture of ruthenium oxide and rhodium oxide.
Claim 7
Dependent Claim
21 words
An electrode as claimed in claim 1, wherein the noble metal oxide is a mixture of ruthenium oxide and iridium oxide.
Claim 8
Dependent Claim
33 words
An electrode as in claim 1 wherein the total amount of titanium oxide plus zirconium oxide contains from 10 to 45 mol % titanium oxide and 1 to 15 mol % zirconium oxide.
Claim 9
Dependent Claim
15 words
An electrode as claimed in claim 7 wherein the noble metal oxide is ruthenium oxide.
Claim 10
Dependent Claim
21 words
An electrode as claimed in claim 7 wherein the noble metal oxide is a mixture of ruthenium oxide and platinum oxide.
Claim 11
Dependent Claim
21 words
An electrode as claimed in claim 7 wherein the noble metal oxide is a mixture of ruthenium oxide and palladium oxide.
Claim 12
Dependent Claim
21 words
An electrode as claimed in claim 7 wherein the noble metal oxide is a mixture of ruthenium oxide and rhodium oxide.
Claim 13
Dependent Claim
21 words
An electrode as claimed in claim 7 wherein the noble metal oxide is a mixture of ruthenium oxide and iridium oxide.
Claim 14
Dependent Claim
150 words
A process for producing an electrode comprising an anti-corrosive conductor having a coating of a solid solution containing at least one noble metal oxide together with titanium oxide and zirconium oxide, the total amount of titanium oxide plus zirconium oxide being from 1 to 50 mol %; said total amount containing from 0.5 to 49.5 mol % titanium dioxide and 0.5 to 49.5 mol % zirconium oxide; which process comprises coating said anti-corrosive conductor by precipitating a mixture containing a sufficient amount of a noble metal compound, a titanium compound, and a zirconium compound from a solution containing said compounds to produce the said solid solution when said precipitate is heated at a temperature of from 300° to 700° C in the presence of oxygen, and thereafter heating said precipitate at a temperature of from 300° to 700° C in the presence of sufficient oxygen to oxidize the said compounds.
Claim 15
Dependent Claim
150 words
A process for producing an electrode comprising an anti-corrosive conductor having a coating of a solid solution containing at least one noble metal oxide together with titanium oxide and zirconium oxide, the total amount of titanium oxide plus zirconium oxide being from 1 to 50 mol %; said total amount containing from 0.5 to 49.5 mol % titanium dioxide and 0.5 to 49.5 mol % zirconium oxide; which process comprises coating said anti-corrosive conductor by precipitating a mixture containing a sufficient amount of a noble metal compound, a titanium compound, and a zirconium compound from a solution containing said compounds to produce the said solid solution when said precipitate is heated at a temperature of from 300° to 700° C in the presence of oxygen, and thereafter heating said precipitate at a temperature of from 300° to 700° C in the presence of sufficient oxygen to oxidize the said compounds.
Claim 16
Dependent Claim
20 words
A process as claimed in claim 13 wherein heating is effected at a temperature of from 400° to 600° C.
Claim 17
Dependent Claim
18 words
A process as claimed in claim 13, wherein the coating and the heating are repeated in plural cycles.
Claim 18
Dependent Claim
22 words
A process as claimed in claim 15, wherein the thickness of coating per each cycle is controlled to 0.5 micron or less.
References Cited (Backward Citations)
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US3677917A
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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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |