US4471006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of electrolytic electrode having high durability
Assignee: De Nora Permelec Ltd
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Filing: 1984-04-23
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Granted: 1984-09-11
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Expires: 2004-04-23
Abstract
Abstract An electrolytic electrode which exhibits high durability when used in electrolysis in which the generation of oxygen is involved and a process for the production of same. The electrolytic electrode comprises (a) an electrode substrate of an electrically-conductive metal; (b) an electrode coating of an electrode active substance; and (c) an intermediate layer provided between the electrode substrate and the electrode coating, said intermediate layer comprising a mixed oxide of (i) an oxide of Ti and/or Sn having a valence number of 4 and (ii) an oxide of Ta and/or Nb having a valence number of 5.
Inventors
- 👤 Hiroshi Asano
- 👤 Takayuki Shimamune
- 👤 Hideo Nitta
- 👤 Ryuta Hirayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:15
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/046; C25B11/051; C25B11/073; C25B11/091
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
A process for producing an electrolytic electrode which comprises (a) coating an electrically-conductive mixed oxide of (i) an oxide of Ti and/or Sn and (ii) an oxide of Ta, on an electrode substrate of an electrically-conductive metal by a thermal decomposition method to form an intermediate layer; thereafter, (b) coating an electrode active substance on the intermediate layer.
Claim 2
Dependent Claim
58 words
A process for producing an electrolytic electrode which comprises (a) coating an electrically-conductive mixed oxide of (i) an oxide of Ti and/or Sn and (ii) an oxide of Ta, on an electrode substrate of an electrically-conductive metal by a thermal decomposition method to form an intermediate layer; thereafter, (b) coating an electrode active substance on the intermediate layer.
Claim 3
Dependent Claim
23 words
The process as claimed in claim 1, wherein the electrode active substance is coated on the intermediate layer by a thermal decomposition method.
Claim 4
Dependent Claim
35 words
The process as claimed in claim 1, wherein the electrically-conductive metal is selected from at least one member of the group consisting of titanium (Ti), tantalum (Ta), niobium (Nb), zirconium (Zr) and their base alloys.
Claim 5
Dependent Claim
25 words
The process as claimed in claim 1, wherein the molar ratio of the Ti and/or Sn oxide to the Ta oxide is 95:5 to 10:90.
Claim 6
Dependent Claim
34 words
The process as claimed in claim 1, wherein the mixed oxide of the intermediate layer is coated on the electrode substrate in an amount of from 0.1×10 -2 to 10×10 -2 mol/m 2 .
Claim 7
Dependent Claim
39 words
The process as claimed in claim 1, wherein the electrode active substance is selected from the group consisting of a platinum group metal oxide and a mixed oxide of a platinum group metal oxide and a valve metal oxide.
References Cited (Backward Citations)
US3773555A
Cited
US4039400A
Cited
US3950240A
Cited
US4212725A
Cited
US4395436A
Cited
US4444642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |