US4133778A
Expired / Lapsed
US
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Electrode with lanthanum-containing perovskite surface
Assignee: Olin Corp
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Filing: 1978-02-21
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Granted: 1979-01-09
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Expires: 1998-02-21
Abstract
Abstract An electrode is described which is comprised of an electroconductive substrate having an exterior surface of perovskite of the empirical formula A A' B O3(I) a. wherein A is lanthanum, B. WHEREIN A' is an alkaline earth metal selected from the group consisting of calcium, strontium, barium, and mixtures thereof, C. WHEREIN B is a transition metal selected from the group consisting of cobalt, chromium, tungsten, molybdenum, manganese, iron, nickel, rhenium, uranium, and mixtures thereof, D. WHEREIN THE ATOMIC RATIO OF A:A' is in the range from about 0.05:1 to about 0.95:
Inventors
- 👤 Thomas J. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/016; C04B35/42; C04B35/495; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; C25B11/077; C25B11/0773; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
77 words
The method for preparing a perovskite electrode for the electrolysis of aqueous brine, wherein said electrode is comprised of an electroconductive substrate and a perovskite surface of the empirical formula A A' BO.sub.3 wherein the atomic ratio of A:A' is in the range from about 0.05:1 to about 0.95:1 and wherein the valence of A + A' + B = 6, said method comprising: A. admixing 1. an oxide of lanthanum to provide said A component, 2.
Claim 2
Independent Claim
77 words
The method for preparing a perovskite electrode for the electrolysis of aqueous brine, wherein said electrode is comprised of an electroconductive substrate and a perovskite surface of the empirical formula A A' BO.sub.3 wherein the atomic ratio of A:A' is in the range from about 0.05:1 to about 0.95:1 and wherein the valence of A + A' + B = 6, said method comprising: A. admixing 1. an oxide of lanthanum to provide said A component, 2.
Claim 3
Dependent Claim
149 words
a compound of an alkaline earth metal to provide said A' component, wherein said alkaline earth metal is selected from the group consisting of (a) alkaline earth metal oxides, (b) alkaline earth metal carbonates, (c) alkaline earth metal hydroxides, and mixtures thereof, and 3. an oxide of a transition metal to provide said B component, wherein said transition metal is selected from the group consisting of (a) cobalt, (b) chromium, (c) tungsten, (d) molybdenum, (e) manganese, (f) iron, (g) nickel, (h) rhenium, (i) uranium, and (j) mixtures thereof, B. firing the resulting mixture to effect formation of said perovskite composition, C. reducing the particle size of said perovskite composition to pass through a 325 mesh screen, D. compressing the finely divided perovskite particles into a desired electrode form, and E. firing the resulting compressed perovskite electrode at a temperature above about 1100° C. to effect binding of said perovskite
Claim 4
Dependent Claim
149 words
a compound of an alkaline earth metal to provide said A' component, wherein said alkaline earth metal is selected from the group consisting of (a) alkaline earth metal oxides, (b) alkaline earth metal carbonates, (c) alkaline earth metal hydroxides, and mixtures thereof, and 3. an oxide of a transition metal to provide said B component, wherein said transition metal is selected from the group consisting of (a) cobalt, (b) chromium, (c) tungsten, (d) molybdenum, (e) manganese, (f) iron, (g) nickel, (h) rhenium, (i) uranium, and (j) mixtures thereof, B. firing the resulting mixture to effect formation of said perovskite composition, C. reducing the particle size of said perovskite composition to pass through a 325 mesh screen, D. compressing the finely divided perovskite particles into a desired electrode form, and E. firing the resulting compressed perovskite electrode at a temperature above about 1100° C. to effect binding of said perovskite
Claim 5
Dependent Claim
19 words
particles. 2. The method of claim 1 wherein said alkaline earth metal compound is an alkaline earth metal oxide.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein said alkaline earth metal compound is an alkaline earth metal carbonate.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein said alkaline earth metal compound is alkaline earth metal hydroxide.
Claim 8
Dependent Claim
30 words
The method of claim 1 wherein said alkaline earth metal compound is selected from the group consisting of calcium oxide, barium oxide, strontium carbonate, strontium hydroxide hexahydrate and mixtures thereof.
Claim 9
Dependent Claim
14 words
The method of claim 5 wherein said alkaline earth metal compound is calcium oxide.
Claim 10
Dependent Claim
14 words
The method of claim 5 wherein said alkaline earth metal compound is barium oxide.
Claim 11
Dependent Claim
20 words
The method of claim 5 wherein said alkaline earth metal compound is a mixture of strontium carbonate and calcium oxide.
Claim 12
Dependent Claim
20 words
The method of claim 5 wherein said alkaline earth metal compound is a mixture of strontium carbonate and barium oxide.
Claim 13
Dependent Claim
20 words
The method of claim 5 wherein said alkaline earth metal compound is a mixture of calcium oxide and barium oxide.
Claim 14
Dependent Claim
14 words
The method of claim 5 wherein said alkaline earth metal compound is strontium carbonate.
Claim 15
Dependent Claim
15 words
The method of claim 5 wherein said alkaline earth metal compound is strontium hydroxide hexahydrate.
Claim 16
Dependent Claim
26 words
The method of claim 1 wherein said oxide of said transition metal is selected from the group consisting of cobalt oxide, manganese oxide, and chromium oxide.
Claim 17
Dependent Claim
13 words
The method of claim 11 wherein said transition metal oxide is cobalt oxide.
Claim 18
Dependent Claim
13 words
The method of claim 11 wherein said transition metal oxide is manganese oxide.
Claim 19
Dependent Claim
13 words
The method of claim 11 wherein said transition metal oxide is chromium oxide.
Claim 20
Dependent Claim
13 words
The method of claim 12 wherein said transition metal oxide is cobalt oxide.
Claim 21
Dependent Claim
11 words
The method of claim 1 wherein said electroconductive substrate is perovskite.
Claim 22
Dependent Claim
26 words
The method of claim 1 wherein said electroconductive substrate is a valve metal selected from the group consisting of titanium, tantalum, zirconium, niobium and mixtures thereof.
Claim 23
Dependent Claim
11 words
The method of claim 19 wherein said valve metal is titanium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |