US4279709A
Expired / Lapsed
US
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Preparation of porous electrodes
Assignee: Dow Chemical Co
•
Filing: 1979-05-08
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Granted: 1981-07-21
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Expires: 1999-05-08
Abstract
Abstract Electrodes with porous coatings are produced using an inorganic compound which is soluble in an aqueous solution, as the pore former in the coating. The inorganic pore former may be removed from the coating while the electrode is being used in an electrolytic cell without contaminating the electrolyte. Such electrodes are particularly useful in electrolytic cells, wherein they operate at a significantly lower voltage and have a longer life span than conventional electrodes.
Inventors
- 👤 John M. McIntyre
- 👤 Donald L. Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:20
CPC Classifications
C; C25; C25B; C25B11/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
64 words
An improvement in the process for preparing electrodes having a porous coating including the steps of (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) a pore former; and (b) removing the pore former from the electrode coating, wherein the improvement consists of removing the pore former while the electrode is in use in an electrolytic cell.
Claim 2
Dependent Claim
64 words
An improvement in the process for preparing electrodes having a porous coating including the steps of (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) a pore former; and (b) removing the pore former from the electrode coating, wherein the improvement consists of removing the pore former while the electrode is in use in an electrolytic cell.
Claim 3
Dependent Claim
75 words
The process of electrolyzing an electrolyte in an electrolytic cell wherein: (1) the electrode is coated with an admixture of an electroconductive metal and an inorganic compound; wherein said inorganic compound is selected so that it is the same salt that is contained in the electrolyte; (2) the electrode is placed in use in the electrolytic cell; and (3) the inorganic compound is leached by the electrolyte, leaving a porous coating on the electroconductive metal.
Claim 4
Dependent Claim
75 words
The process of electrolyzing an electrolyte in an electrolytic cell wherein: (1) the electrode is coated with an admixture of an electroconductive metal and an inorganic compound; wherein said inorganic compound is selected so that it is the same salt that is contained in the electrolyte; (2) the electrode is placed in use in the electrolytic cell; and (3) the inorganic compound is leached by the electrolyte, leaving a porous coating on the electroconductive metal.
Claim 5
Dependent Claim
16 words
The process of claim 2 wherein the electrolyte is an aqueous solution of a metal salt.
Claim 6
Dependent Claim
17 words
The process of claim 2 wherein the electrolyte is an aqueous solution of an alkali metal halide.
Claim 7
Dependent Claim
14 words
The process of claim 2 wherein the coated electrode is used as a cathode.
Claim 8
Dependent Claim
53 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate, using plasma spraying techniques, with an admixture of (i) an electroconductive metal; and (ii) an inorganic compound which is soluble in an aqueous solution; and (b) removing the inorganic compound from the electrode coating.
Claim 9
Dependent Claim
53 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate, using plasma spraying techniques, with an admixture of (i) an electroconductive metal; and (ii) an inorganic compound which is soluble in an aqueous solution; and (b) removing the inorganic compound from the electrode coating.
Claim 10
Dependent Claim
53 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate, using flame spraying techniques, with an admixture of: (i) an electroconductive metal; and (ii) an inorganic compound which is soluble in an aqueous solution; and (b) removing the inorganic compound from the electrode coating.
Claim 11
Dependent Claim
53 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate, using flame spraying techniques, with an admixture of: (i) an electroconductive metal; and (ii) an inorganic compound which is soluble in an aqueous solution; and (b) removing the inorganic compound from the electrode coating.
Claim 12
Dependent Claim
112 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode susbstrate with an admixture of: (1) electroconductive metallic compound, which is composed of at least one element selected from the group consisting of the elements listed in Groups I-B, V-B, VI-B, VII-B and VIII of the Mendeleev Periodic Table and at least one other element which is selected from the group consisting of one or more of the elements in the class consisting of boron, carbon, nitrogen, silicon, phosphorous, sulfur, arsenic, selenium and tellurium; and (2) an inorganic compound soluble in an aqueous solution; and (b) removing the inorganic compound from the electrode coating.
Claim 13
Dependent Claim
112 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode susbstrate with an admixture of: (1) electroconductive metallic compound, which is composed of at least one element selected from the group consisting of the elements listed in Groups I-B, V-B, VI-B, VII-B and VIII of the Mendeleev Periodic Table and at least one other element which is selected from the group consisting of one or more of the elements in the class consisting of boron, carbon, nitrogen, silicon, phosphorous, sulfur, arsenic, selenium and tellurium; and (2) an inorganic compound soluble in an aqueous solution; and (b) removing the inorganic compound from the electrode coating.
Claim 14
Dependent Claim
47 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) an inorganic oxide soluble in an aqueous solution; and (b) removing the inorganic oxide from the electrode coating.
Claim 15
Dependent Claim
47 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) an inorganic oxide soluble in an aqueous solution; and (b) removing the inorganic oxide from the electrode coating.
Claim 16
Dependent Claim
47 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) an inorganic sulfide soluble in an aqueous solution; and (b) removing the inorganic sulfide from the electrode coating.
Claim 17
Dependent Claim
47 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) an inorganic sulfide soluble in an aqueous solution; and (b) removing the inorganic sulfide from the electrode coating.
Claim 18
Dependent Claim
57 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) an inorganic compound soluble in an aqueous solution; and (b) removing the inorganic compound from the electrode coating while the electrode is in use in an electrolytic cell.
Claim 19
Dependent Claim
57 words
The process of preparing electrodes having a porous coating comprising the steps of: (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) an inorganic compound soluble in an aqueous solution; and (b) removing the inorganic compound from the electrode coating while the electrode is in use in an electrolytic cell.
Claim 20
Dependent Claim
101 words
An improvement in the process for preparing electrodes having a porous coating including the steps of: (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) a pore former; and (b) removing the pore former from the electrode coating, wherein the improvement consists of using, as the pore former, an inorganic compound which is soluble in an aqueous solution and is selected to match the composition of an electrolyte which is to be used in an electrolytic cell, so that no contamination of the electrolyte occurs when the inorganic compound is leached by the electrolyte.
Claim 21
Dependent Claim
101 words
An improvement in the process for preparing electrodes having a porous coating including the steps of: (a) coating an electroconductive electrode substrate with an admixture of: (1) an electroconductive metal; and (2) a pore former; and (b) removing the pore former from the electrode coating, wherein the improvement consists of using, as the pore former, an inorganic compound which is soluble in an aqueous solution and is selected to match the composition of an electrolyte which is to be used in an electrolytic cell, so that no contamination of the electrolyte occurs when the inorganic compound is leached by the electrolyte.
Claim 22
Dependent Claim
17 words
The product produced by the process of claims 1, 2, 6, 7, 9, 10, 11 or 12.
References Cited (Backward Citations)
US489284A
Cited
US1263959A
Cited
US2241095A
Cited
US2598318A
Cited
US2858256A
Cited
US2999798A
Cited
US2969315A
Cited
US2928783A
Cited
US3067045A
Cited
US3272728A
Cited
US3219730A
Cited
US3326725A
Cited
US3287142A
Cited
US3316159A
Cited
US3497425A
Cited
US3403057A
Cited
US3492720A
Cited
US3427204A
Cited
US3649355A
Cited
US3630770A
Cited
US3681136A
Cited
US3802878A
Cited
US3788968A
Cited
US3713891A
Cited
US3945907A
Cited
US3974058A
Cited
US3992278A
Cited
US4024044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |