US4142005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing an electrode for electrolytic cell having a coating of a single metal spinel, Co3 O4
Assignee: Dow Chemical Co
•
Filing: 1976-02-27
•
Granted: 1979-02-27
•
Expires: 1996-02-27
Abstract
Abstract Electrodes particularly suitable for use as anodes in electrolytic cells are prepared by coating an electrically-conductive substrate with a thermally-decomposable inorganic cobalt compound and then thermally oxidizing the inorganic cobalt compound under conditions at which the single-metal spinel, Co 3 O 4 , is formed.
Inventors
- 👤 Donald L. Caldwell
- 👤 Mark J. Hazelrigg, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:50
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; C25B11/077; C25B11/0771
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
152 words
A process for preparing improved electrolytic cell anodes comprising an electrically-conductive substrate having a coating consisting essentially of a single-metal spinel, Co 3 O 4 , the said process comprising (a) providing an electrically-conductive substrate substantially free of foreign matter or oxide film, (b) applying to the substrate a thin coating of a thermally decomposable inorganic cobalt compound which, when thermally decomposed in the presence of oxygen gives Co 3 O 4 , (c) heating the so-coated substrate at a temperature in the range of about 200° C. to about 600° C. in an oxidizing atmosphere for a time sufficient to oxidize the inorganic cobalt compound to Co 3 O 4 , then cooling it, and (d) repeating the above coating step (b) and heating step (c) until the layer of Co 3 O 4 on the substrate has a thickness in the range of about 0.01 mm to about 0.08 mm.
Claim 2
Dependent Claim
152 words
A process for preparing improved electrolytic cell anodes comprising an electrically-conductive substrate having a coating consisting essentially of a single-metal spinel, Co 3 O 4 , the said process comprising (a) providing an electrically-conductive substrate substantially free of foreign matter or oxide film, (b) applying to the substrate a thin coating of a thermally decomposable inorganic cobalt compound which, when thermally decomposed in the presence of oxygen gives Co 3 O 4 , (c) heating the so-coated substrate at a temperature in the range of about 200° C. to about 600° C. in an oxidizing atmosphere for a time sufficient to oxidize the inorganic cobalt compound to Co 3 O 4 , then cooling it, and (d) repeating the above coating step (b) and heating step (c) until the layer of Co 3 O 4 on the substrate has a thickness in the range of about 0.01 mm to about 0.08 mm.
Claim 3
Dependent Claim
75 words
The process of claim 1 wherein there is simultaneously applied to the substrate along with the cobalt compound an oxide-forming modifier metal compound selected from the group consisting of metals of the Periodic Table of the Elements Groups III-B, IV-B, V-B, VI-B, VII-B, Lanthanides, Actinides, III-A, IV-A, and V-A, the said modifier metal compound being in an amount to provide, as oxide, up to 50% of the total weight of the metal of the coating.
Claim 4
Dependent Claim
41 words
The process of claim 2 wherein the oxide-forming metal compound is a compound of a metal selected from the group consisting of cerium, bismuth, lead, vanadium, zirconium, tantalum, niobium, molybdenum, chromium, tin, aluminum, antimony, titanium, and tungsten and mixtures of these.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein the metal is zirconium, vanadium, lead or mixtures of these.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the inorganic cobalt compound is applied to the substrate in an inert, relatively volatile carrier.
Claim 7
Dependent Claim
24 words
The process of claim 5 wherein the carrier is selected from the group consisting of water, alcohol, aldehyde, ketone, ether and mixtures of these.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the inorganic cobalt compound is cobalt nitrate dissolved in water, acetone or a mixture of water and acetone.
Claim 9
Dependent Claim
34 words
The process of claim 1 wherein the inorganic cobalt compound is at least one compound selected from the group consisting of cobalt nitrate, cobalt carbonate, cobalt hydroxide, cobalt chlorate, cobalt chloride and cobalt fluoride.
Claim 10
Dependent Claim
13 words
The process of claim 1 wherein the electroconductive substrate comprises a film-forming metal.
Claim 11
Dependent Claim
27 words
The process of claim 1 wherein the electroconductive substrate comprises a metal selected from the group consisting of titanium, tantalum, tungsten, zirconium, molybdenum, niobium, hafnium, and vanadium.
Claim 12
Dependent Claim
22 words
The process of claim 1 wherein the electroconductive substrate comprises a metal selected from the group consisting of titanium, tantalum, and tungsten.
Claim 13
Dependent Claim
14 words
The process of claim 1 wherein the electroconductive substrate comprises titanium or titanium alloys.
Claim 14
Dependent Claim
23 words
The process of claim 1 wherein the electroconductive substrate is in the form of a mesh, plate, sheet, screen, rod, cylinder, or strip.
Claim 15
Dependent Claim
104 words
In the process of preparing an electrolytic cell anode comprising an electroconductive substrate having a coating consisting essentially of Co 3 O 4 , said coating being deposited on said substrate by (a) applying a thermally-decomposable cobalt compound to the substrate, (b) then heating at a temperature in the range of about 200° C. to about 600° C. in an oxidizing atmosphere to form the Co 3 O 4 , and (c) cooling the so-coated substrate and repeating steps (a) and (b) and (c) a plurality of times, the improvement which comprises the use of an inorganic cobalt compound as the thermally-decomposable cobalt compound.
Claim 16
Dependent Claim
104 words
In the process of preparing an electrolytic cell anode comprising an electroconductive substrate having a coating consisting essentially of Co 3 O 4 , said coating being deposited on said substrate by (a) applying a thermally-decomposable cobalt compound to the substrate, (b) then heating at a temperature in the range of about 200° C. to about 600° C. in an oxidizing atmosphere to form the Co 3 O 4 , and (c) cooling the so-coated substrate and repeating steps (a) and (b) and (c) a plurality of times, the improvement which comprises the use of an inorganic cobalt compound as the thermally-decomposable cobalt compound.
Claim 17
Dependent Claim
20 words
The process of claim 14 wherein the electroconductive substrate is titanium and wherein the inorganic cobalt compound is cobalt nitrate.
Claim 18
Dependent Claim
24 words
The process of claim 14 wherein the inorganic cobalt compound is cobalt nitrate carried in acetone, water, or a mixture of acetone and water.
References Cited (Backward Citations)
US1902185A
Cited
US2631115A
Cited
GB909299A
Cited
US3081200A
Cited
GB1206863A
Cited
US3663280A
Cited
US3711397A
Cited
US3954512A
Cited
US4042483A
Cited
US3977958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |