US3869312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodes and electrochemical processes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-09-04
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Granted: 1975-03-04
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Expires: 1993-09-04
Abstract
Abstract A method for manufacturing an electrode for use in electrochemical processes which comprises coating a support member made of a film-forming metal or alloy thereof with a first layer of a mixture of a platinum group metal and a film-forming metal oxide and then coating said first layer with a second layer consisting of a film-forming metal oxide.
Inventors
- 👤 Keith Graham Moss
- 👤 Nicholas William Jame Pumphrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:22
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
242 words
A METHOD FOR MANUFACTURE OF AN ELECTRODE FOR USE IN ELECTROCHEMICAL PROCESSES WHEREIN SAID ELECTRODE COMPRISES A SUPPORT MEMBER MADE OF A FILM-FORMING METAL OR AN ALLOY THEREOF HAVING A COATING THEREON CONSISTING OF AT LEAST ONE LAYER OF A MIXTURE OF THE OXIDE OF AT LEAST ONE PLATINUM GROUP METAL IN A PROPORTION OF 20-80 PERCENT BY WEIGHT AND A FILMFORMING METAL OXIDE AND SUPERIMPOSED ON THE SAID LAYER A LAYER CONSISTING OF A FILM-FORMING METAL OXIDE WHICH COMPRISES THE STEPS OF (1) APPLYING ON SAID SUPPORT MEMBER AT LEAST ONE COATING OF A COMPOSITION COMPRISING A THERMALLYDECOMPOSABLE COMPOUND OF AT LEAST ONE PLATINUM GROUP METAL AND A THERMALLY-DECOMPOSABLE ORGANO-COMPOUND OF A FILMFORMING METAL IN AN ORGAIC LIQUID VEHICLE, DRYING EACH COATING BY EVAPORATION OF THE LIQUID VEHICLE AND THEN HEATING EACH COATING IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE OF AT LEAST 350*C. TO CONVERT THE COMPOUNDS OF THE PLATINUM GROUP METALS AND THE FILM-FORMING METAL TO MIXED OXIDES OF THESE METALS, AND (2) APPLYING OVER THE LAYER OF MIXED OXIDES THUS PRODUCED ON THE SUPPORT MEMBER AT LEAST ONE COATING OF A THERMALLY DECOMPOSABLE ORGANO-COMPOUND OF A FILM-FORMING METAL IN AN ORGAIC LIQUID VEHICLE, SAID LAST-MENTIONED CAOTING BEING FREE FROM ANY PLATINUM GROUP METAL OR COMPOUND THEREOF, DRYING EACH COATING BY EVAPORATION OF THE LIQUID VEHICLE AND THEN HEATING EACH COTAING IN AN OXIDIZING ATMOSPHERE TO CONVENT THE ORGANO-COMPOUND OF THE FILM-FORMING METAL TO THE OXIDE OF THE METAL.
Claim 2
Independent Claim
242 words
A METHOD FOR MANUFACTURE OF AN ELECTRODE FOR USE IN ELECTROCHEMICAL PROCESSES WHEREIN SAID ELECTRODE COMPRISES A SUPPORT MEMBER MADE OF A FILM-FORMING METAL OR AN ALLOY THEREOF HAVING A COATING THEREON CONSISTING OF AT LEAST ONE LAYER OF A MIXTURE OF THE OXIDE OF AT LEAST ONE PLATINUM GROUP METAL IN A PROPORTION OF 20-80 PERCENT BY WEIGHT AND A FILMFORMING METAL OXIDE AND SUPERIMPOSED ON THE SAID LAYER A LAYER CONSISTING OF A FILM-FORMING METAL OXIDE WHICH COMPRISES THE STEPS OF (1) APPLYING ON SAID SUPPORT MEMBER AT LEAST ONE COATING OF A COMPOSITION COMPRISING A THERMALLYDECOMPOSABLE COMPOUND OF AT LEAST ONE PLATINUM GROUP METAL AND A THERMALLY-DECOMPOSABLE ORGANO-COMPOUND OF A FILMFORMING METAL IN AN ORGAIC LIQUID VEHICLE, DRYING EACH COATING BY EVAPORATION OF THE LIQUID VEHICLE AND THEN HEATING EACH COATING IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE OF AT LEAST 350*C. TO CONVERT THE COMPOUNDS OF THE PLATINUM GROUP METALS AND THE FILM-FORMING METAL TO MIXED OXIDES OF THESE METALS, AND (2) APPLYING OVER THE LAYER OF MIXED OXIDES THUS PRODUCED ON THE SUPPORT MEMBER AT LEAST ONE COATING OF A THERMALLY DECOMPOSABLE ORGANO-COMPOUND OF A FILM-FORMING METAL IN AN ORGAIC LIQUID VEHICLE, SAID LAST-MENTIONED CAOTING BEING FREE FROM ANY PLATINUM GROUP METAL OR COMPOUND THEREOF, DRYING EACH COATING BY EVAPORATION OF THE LIQUID VEHICLE AND THEN HEATING EACH COTAING IN AN OXIDIZING ATMOSPHERE TO CONVENT THE ORGANO-COMPOUND OF THE FILM-FORMING METAL TO THE OXIDE OF THE METAL.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein the said support member is made of titanium or a titanium alloy having anodic polarisation properties similar to those of titanium.
Claim 4
Dependent Claim
24 words
A method according to claim 1, wherein in step (1) the thermally decomposable compound of at least one platinum group metal is ruthenium trichloride.
Claim 5
Dependent Claim
27 words
A method according to claim 1, wherein in step (1) the temperature at which each coating is heated in an oxidising atmosphere is in the range 400*-550*C.
Claim 6
Dependent Claim
48 words
A method according to claim 1, wherein in step (1) the number of coatings of the said composition applied, dried and heated on the support member is sufficient to build up a layer of mixed oxides amounting to 10-15 g/m2 of the coated surface of this support member.
Claim 7
Dependent Claim
33 words
A method according to claim 1, wherein in step (1) the thermally-decomposable organo-compound of a film-forming metal is an alkyl titanate or an alkyl halotitanate wherein the halogen is chlorine, bromine or fluorine.
Claim 8
Dependent Claim
62 words
A method according to claim 1, wherein the proportions of platinum group metal compounds and film-forming metal compound in the said composition employed in step (1) are chosen so that the ratio of platinum group metal oxides:film-forming metal oxide in the said layer of mixed oxides produced in step (1) is not less than 1:1 but is less than 2:1 by weight.
Claim 9
Dependent Claim
43 words
A method according to claim 1, wherein the total amount of coating which is applied over the said layer of mixed oxides is sufficient to produce in step (2) a layer of film-forming metal oxide amounting to 2-10 g/m2 of the coated surface.
Claim 10
Dependent Claim
34 words
A method according to claim 1, wherein in step (2) the thermally decomposable organo-compound of a film-forming metal is an alkyl titanate or an alkyl halotitanate wherein the halogen is chlorine, bromine or fluorine.
Claim 11
Dependent Claim
26 words
A method according to claim 9, wherein in step (2) each coating is dried at 100*-200*C and is then heated at 250*-800*C in an oxidising atmosphere.
Claim 12
Dependent Claim
22 words
A method according to claim 10, wherein in step (2) each coating after drying is heated at 350*-550*C in an oxidising atmosphere.
References Cited (Backward Citations)
US3645862A
Cited
US3616445A
Cited
US3663280A
Cited
US3562008A
Cited
US3718551A
Cited
US3773555A
Cited
US3773554A
Cited
US3711385A
Cited
US3684543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |