Patent US4290859A successfully refreshed from Google Patents.
US4290859A
Expired / Lapsed
US
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Process for preparing electrode
Assignee: AGC Inc
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Filing: 1980-05-16
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Granted: 1981-09-22
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Expires: 2000-05-16
Abstract
Abstract An electrode is prepared by plating on an electrode substrate in a dispersion coating method to form a metal layer partially exposed porous particles of Ag on the electrode substrate, and, if desired, a middle layer is formed between the electrode substrate and the metal layer. The porous particles can be formed by etching an alloy of the particles.
Inventors
- 👤 Yoshio Oda
- 👤 Hiroshi Otouma
- 👤 Eiji Endoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:43
CPC Classifications
C; C25; C25D; C25D15/00; C25D15/02; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
39 words
An electrode which comprises a metal layer of silver bonded to a metallic electrode substrate, which metal layer contains partially exposed particles comprising silver, the content of the particles in the metal layer ranging from 5 to 80 wt.%.
Claim 2
Dependent Claim
39 words
An electrode which comprises a metal layer of silver bonded to a metallic electrode substrate, which metal layer contains partially exposed particles comprising silver, the content of the particles in the metal layer ranging from 5 to 80 wt.%.
Claim 3
Dependent Claim
25 words
An electrode according to claim 1 wherein the electrical double layer capacity of the surface of said electrode is greater than 1000 μF/cm 2 .
Claim 4
Dependent Claim
22 words
An electrode according to claim 1 wherein the proportion of the particles in the metal layer is from 5 to 80 wt.%.
Claim 5
Dependent Claim
39 words
An electrode according to claim 1 wherein a middle layer of at least one metal selected from the group consisting of nickel, cobalt, silver and copper is formed between the electrode substrate and the metal layer containing the particles.
Claim 6
Dependent Claim
51 words
An electrode according to claim 1 wherein the particles are formed by removing at least part of a second metal component from particles made of an alloy of Ag and the second metal component, the second metal being selected from the group consisting of Al, Zn, Mg, Si, Sb and Sn.
Claim 7
Dependent Claim
17 words
An electrode according to claim 1 or 5 wherein the particles are made of leached Raney silver.
Claim 8
Dependent Claim
35 words
An electrode according to claim 1 wherein the electrode is used as a cathode for the electrolysis of an aqueous solution of an alkali metal chloride in a diaphragm process or an ion-exchange membrane process.
Claim 9
Dependent Claim
43 words
A process for preparing an electrode which comprises bonding partially exposed particles comprising Ag to a metal layer of Ag which is bonded to a metallic electrode substrate, the content of the particles in the metal layer ranging from 5 to 80 wt.%.
Claim 10
Dependent Claim
43 words
A process for preparing an electrode which comprises bonding partially exposed particles comprising Ag to a metal layer of Ag which is bonded to a metallic electrode substrate, the content of the particles in the metal layer ranging from 5 to 80 wt.%.
Claim 11
Dependent Claim
24 words
A process according to claim 8 wherein the particles and the metal layer are bonded to the electrode substrate by a dispersion coating method.
Claim 12
Dependent Claim
53 words
A process according to claim 8 or 9 wherein the particles are formed by removing at least part of a second metal component from particles made of an alloy of Ag and the second metal component, the second metal being selected from the group consisting of Al, Zn, Mg, Si, Sb, and Sn.
Claim 13
Dependent Claim
63 words
A process according to claim 8 wherein particles made of an alloy of Ag and a second metal component selected from the group consisting of Al, Zn, Mg, Si, Sb and Sn are bonded to the metal layer of Ag on the electrode substrate, and treated with an alkaline solution to dissolve at least part of the second metal component from the particles.
Claim 14
Dependent Claim
31 words
A process according to claim 9 wherein the dispersion is uniformly dispersed by moving vertically a perforated plate at a lower part of a plating vessel in the dispersion coating method.
Claim 15
Dependent Claim
28 words
A process according to claim 9 wherein the dispersion is uniformly dispersed by feeding the dispersion containing the particles into a plating vessel in the dispersion coating method.
Claim 16
Dependent Claim
23 words
A process according to claim 12 wherein a gas is bubbled from the bottom of the plating vessel in the dispersion coating method.
Claim 17
Dependent Claim
17 words
A process according to claim 14 wherein the gas is an inert gas or a reducing gas.
References Cited (Backward Citations)
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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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |