US3711397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode and process for making same
Assignee: PPG Industries Inc
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Filing: 1971-03-08
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Granted: 1973-01-16
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Expires: 1991-03-08
Abstract
Abstract Electrodes suitable for use for electrolytic purposes, for example for the electrolysis of aqueous alkali metal chloride solutions, are disclosed. The electrodes of this invention have an electroconductive substrate with an electro-conductive outer surface containing a spinel thereon, and an intermediate electroconductive layer between the electro-conductive spinel surface and the substrate which intermediate layer contains an oxycompound of a second transition series platinum group metal (ruthenium, rhodium, palladium).
Inventors
- 👤 A Martinsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:20
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093; C25B11/075; C25B11/077; C25B11/0771; C25B11/0773
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
12 words
The electrode of claim 1 wherein the substrate is a valve metal.
Claim 2
Dependent Claim
33 words
The electrode of claim 1 wherein the spinel is selected from the group consisting of CoAl2O4, CoFe2O4, CuAl2O4, CuCo2O4, CuCr2O4, CuFe2O4, FeIIFeIII2O4, CrIICrIII2O4, MnIIMnIII2O4, CoIICoIII2O4, FeIIAlFeIIIO4, MgFe2O4, NiAl2O4, NiFe2O4, NiCr2O4, and mixtures thereof.
Claim 3
Dependent Claim
65 words
The electrode of claim 1 wherein the oxygen-containing compound of a second transition series platinum group metal is selected from the group consisting of oxides of the second transition series platinum group metals, alkali earth oxides of the second transition series platinum group metals, rare earth oxides of the second transition series platinum group metals, and spinels of the second transition series platinum group metals.
Claim 4
Dependent Claim
29 words
The electrode of claim 1 wherein the layer comprising an oxygen-containing compound of a second transition series platinum group metal is from about 2 to about 10 micro-inches thick.
Claim 5
Dependent Claim
72 words
In an electrolytic cell for the electrolysis of aqueous alkali metal chloride solutions and having a cathode and an anode and means for imposing an electromotive force therebetween, the improvement which comprises: the said anode comprising an electroconductive substrate; an electroconductive surface comprising a spinel; and an intermediate layer comprising an oxygen-containing compound of a second transition series platinum group metal between and in contact with the substrate and the electroconductive surface.
Claim 6
Dependent Claim
66 words
The electrolytic cell of claim 6 wherein the oxygen-containing compound of a second transition series platinum grouP metal is selected from the group consisting of oxides of the second transition series platinum group metals, alkali earth oxides of the second transition series platinum group metals, rare earth oxides of the second transition series platinum group metals, and spinels of the second transition series platinum group metals.
Claim 7
Dependent Claim
59 words
A process for the electrolysis of aqueous alkali metal chlorides comprising: causing an electric current to pass to a cathode from an anode having an electroconductive substrate, an outer surface comprising a spinel, and a layer comprising an oxygen-containing compound of a second transition series platinum group metal between and in contact with the substrate and the outer surface.
Claim 8
Dependent Claim
64 words
The method of claim 8 wherein the oxy-compound of a second transition series platinum group metal is selected from the group consisting of oxides of the second transition series platinum group metals, alkali earth oxides of the second transition series platinum group metals, rare earth oxides of the second transition series platinum group metals, and spinels of the second transition series platinum group metals.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |