US3986942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic process and apparatus
Assignee: Occidental Chemical Corp
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Filing: 1975-02-27
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Granted: 1976-10-19
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Expires: 1995-02-27
Abstract
Abstract An electrode, for use in electrolytic processes, comprises a valve metal substrate, such as titanium, a coating thereon of conductive tin oxide, and an outer coating of a noble metal or noble metal oxide. The electrode is particularly adapted to use in a chlorate cell wherein an aqueous alkali metal chloride solution is electrolyzed to produce an alkali metal chlorate.
Inventors
- 👤 Edward H. Cook, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:41
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
In a method of electrolyzing aqueous alkali metal chloride solutions wherein chlorine is liberated at the anode, an alkali metal hydroxide is formed at the cathode and the electrolysis products are mixed to form alkali metal chlorates, the improvement which comprises using as said anode, a composite structure comprising a valve metal substrate, a coating of conductive tin oxide on the surface thereof, and an outer coating, on the surface of the conductive tin oxide, of at least one of a noble metal or noble metal oxide.
Claim 2
Dependent Claim
87 words
In a method of electrolyzing aqueous alkali metal chloride solutions wherein chlorine is liberated at the anode, an alkali metal hydroxide is formed at the cathode and the electrolysis products are mixed to form alkali metal chlorates, the improvement which comprises using as said anode, a composite structure comprising a valve metal substrate, a coating of conductive tin oxide on the surface thereof, and an outer coating, on the surface of the conductive tin oxide, of at least one of a noble metal or noble metal oxide.
Claim 3
Dependent Claim
27 words
A method according to claim 1 wherein the anode comprises a titanium substrate, a coating thereon of conductive tin oxide, and an outer coating or ruthenium oxide.
Claim 4
Dependent Claim
48 words
A method according to claim 1 wherein the conductive tin oxide comprises a mixture of tin oxide and between about 0.1 and 20 percent by weight of antimony oxide, based on the total weight of the mixture when calculated as SnO 2 and Sb 2 O 3 .
Claim 5
Dependent Claim
14 words
A method according to claim 1 wherein the alkali metal chloride is sodium chloride.
Claim 6
Dependent Claim
46 words
An electrolytic cell useful for producing alkali metal chlorates, said cell having a steel cathode and an anode, comprising a valve metal substrate, a coating thereon of conductive tin oxide, and an outer coating of at least one of a noble metal or noble metal oxide.
Claim 7
Dependent Claim
46 words
An electrolytic cell useful for producing alkali metal chlorates, said cell having a steel cathode and an anode, comprising a valve metal substrate, a coating thereon of conductive tin oxide, and an outer coating of at least one of a noble metal or noble metal oxide.
Claim 8
Dependent Claim
13 words
An electrolytic cell according to claim 5 wherein the anode substrate is titanium.
Claim 9
Dependent Claim
29 words
An electrolytic cell according to claim 5 wherein the conductive tin oxide layer in the anode comprises a mixture of tin dioxide and a minor amount of antimony oxide.
Claim 10
Dependent Claim
19 words
An electrolytic cell according to claim 5 wherein the outer coating of the anode is a noble metal oxide.
Claim 11
Dependent Claim
17 words
An electrolytic cell according to claim 5 wherein the outer coating of the anode is ruthenium oxide.
Claim 12
Dependent Claim
54 words
An electrolytic cell according to claim 5 wherein the conductive tin oxide layer in the anode comprises a mixture of tin oxide and between about 0.1 and about 20 percent by weight of antimony oxide, based on the total weight of said mixture when calculated as SnO 2 and Sb 2 O 3 .
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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |