US4233340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing insoluble electrode
Assignee: TDK Corp
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Filing: 1978-11-21
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Granted: 1980-11-11
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Expires: 1998-11-21
Abstract
Abstract An insoluble electrode for electrolysis which comprises repeatedly coating and baking a slurry of palladium oxide containing a platinum compound which can be thermally decomposed to form platinum metal, optionally the other metal salt or oxide in a solvent and a solution of a platinum compound which can be thermally decomposed to form platinum metal in a solvent on a conductive substrate in optional order at two or more times.
Inventors
- 👤 Shunjiro Saito
- 👤 Kazuhide Aue
- 👤 Makoto Kobayashi
- 👤 Akio Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:14
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A process for preparing an insoluble electrode for electrolysis which comprises: (a) coating a conductive substrate with a coating composition selected from the group consisting of: i. a slurry of palladium oxide in a solvent containing a platinum compound, which can be thermally decomposed to form platinum metal, and ii. a solution of a platinum compound, which can be thermally decomposed to form platinum metal, in a solvent; (b) baking the substrate treated by step (a); (c) coating the substrate treated by step (b) with a coating composition selected from the group consisting of said coating composition (a)(i) and said coating composition (a)(ii); wherein the coating composition used in step (c) is different from that used in step (a); (d) baking the substrate treated by step (c); and (e) repeating steps (a) to (d) two or more times.
Claim 2
Dependent Claim
138 words
A process for preparing an insoluble electrode for electrolysis which comprises: (a) coating a conductive substrate with a coating composition selected from the group consisting of: i. a slurry of palladium oxide in a solvent containing a platinum compound, which can be thermally decomposed to form platinum metal, and ii. a solution of a platinum compound, which can be thermally decomposed to form platinum metal, in a solvent; (b) baking the substrate treated by step (a); (c) coating the substrate treated by step (b) with a coating composition selected from the group consisting of said coating composition (a)(i) and said coating composition (a)(ii); wherein the coating composition used in step (c) is different from that used in step (a); (d) baking the substrate treated by step (c); and (e) repeating steps (a) to (d) two or more times.
Claim 3
Dependent Claim
17 words
The process sccording to claim 1 wherein the conductive substrate is made of titanium, tantalum or zirconium.
Claim 4
Dependent Claim
14 words
The process according to claim 1 wherein the solvent is water or an alcohol.
Claim 5
Dependent Claim
21 words
A process according to claim 1 wherein the platinum compound is a halide, a carboxylic acid salt or a haloplatinic acid.
Claim 6
Dependent Claim
38 words
The process according to claim 1 wherein the solution and slurry are prepared so as to give a coated layer comprising 99 to 5 mole % of palladium oxide and 1 to 95 mole % of platinum metal.
Claim 7
Dependent Claim
38 words
The process according to claim 1 wherein a compound of cerium, zirconium, titanium, tantalum or tungsten which can be thermally decomposed to form the oxide thereof further incorporated in the slurry of palladium oxide containing the platinum compound.
Claim 8
Dependent Claim
73 words
The process according to claim 1 wherein the solution of the platinum compound is immersed into porous voids in a coated layer formed by coating and baking the slurry of palladium oxide containing the platinum compound in a solvent and the platinum compound in the porous voids is converted to platinum metal by the thermal decomposition whereby the porous voids are filled with platinum metal and these steps are repeated to form multi-layers.
Claim 9
Dependent Claim
17 words
The process according to claim 1, wherein oxygen is present during the baking steps (b) and (d).
References Cited (Backward Citations)
GB1147442A
Cited
US3632498A
Cited
US3663414A
Cited
US3773555A
Cited
US3773554A
Cited
US3864163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |