US4080278A
Expired / Lapsed
US
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Cathode for electrolytic cell
Assignee: Rhone Poulenc Industries SA
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Filing: 1976-07-06
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Granted: 1978-03-21
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Expires: 1996-07-06
Abstract
Abstract A cathode for an electrolytic cell, providing a low overvoltage on contact with the electrolyte, having at least one surface of a compound comprising (a) a metal of the group comprising nickel, copper, iron and cobalt, and (b) another element of the group comprising any of the preceding metals, titanium, lanthanides, magnesium, boron, molybdenum, manganese, vanadium, niobium and tantalum and their hydrogenation products. The cathode is particularly useful in the electrolysis of alkali chlorides.
Inventors
- 👤 Dominique Ravier
- 👤 Jean Grosbois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:19
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
57 words
An electrolytic cell cathode for electrolysis of an alkaline medium, said cathode comprising at least one surface of a binary mixture of (a) a metal of the group consisting of nickel, cobalt, and copper, and (b) another element of the group consisting of any preceding metal or group (a), titanium, lanthanides, and magnesium, or their hydrogenation products.
Claim 2
Dependent Claim
57 words
An electrolytic cell cathode for electrolysis of an alkaline medium, said cathode comprising at least one surface of a binary mixture of (a) a metal of the group consisting of nickel, cobalt, and copper, and (b) another element of the group consisting of any preceding metal or group (a), titanium, lanthanides, and magnesium, or their hydrogenation products.
Claim 3
Dependent Claim
18 words
A cathode according to claim 1, wherein the binary mixture is made up essentially of titanium and nickel.
Claim 4
Dependent Claim
21 words
A cathode according to claim 2, wherein the proportion of nickel atoms in the binary mixture is from 15 to 85%.
Claim 5
Dependent Claim
21 words
A cathode according to claim 3, wherein the proportion of nickel atoms in the binary mixture is from 15 to 40%.
Claim 6
Dependent Claim
21 words
A cathode according to claim 4, wherein the proportion of nickel atoms in the binary mixture is from 55 to 75%.
Claim 7
Dependent Claim
18 words
A cathode according to claim 1, wherein the said cathode is a uniform solid and free of support.
Claim 8
Dependent Claim
18 words
A cathode according to claim 1, wherein said surface of said cathode is applied to a metal support.
Claim 9
Dependent Claim
126 words
An electrolytic cell cathode for electrolysis of an alkaline medium, said cathode comprising at least one surface of a composition formed by a non-stoichiometric compound consisting of a metal B of the group consisting of titanium, tungsten, molybdenum, manganese, cobalt, vanadium, niobium and tantalum, bonded by a metal M of the group consisting of nickel, cobalt, iron and copper, said non-stoichiometric compound further comprising a bronze of composition of the formula A x B y O z in which O stands for oxygen, A is an inserted metal of the group consisting of alkali metals and lanthanides, B is a metal as above identified, wherein B y O z represents the highest valency oxide of metal B, and x is a number between 0 and 1.
Claim 10
Dependent Claim
126 words
An electrolytic cell cathode for electrolysis of an alkaline medium, said cathode comprising at least one surface of a composition formed by a non-stoichiometric compound consisting of a metal B of the group consisting of titanium, tungsten, molybdenum, manganese, cobalt, vanadium, niobium and tantalum, bonded by a metal M of the group consisting of nickel, cobalt, iron and copper, said non-stoichiometric compound further comprising a bronze of composition of the formula A x B y O z in which O stands for oxygen, A is an inserted metal of the group consisting of alkali metals and lanthanides, B is a metal as above identified, wherein B y O z represents the highest valency oxide of metal B, and x is a number between 0 and 1.
Claim 11
Dependent Claim
25 words
A cathode according to claim 8, wherein the metal A of said non-stoichiometric compound is sodium and the metal B of that compound is titanium.
Claim 12
Dependent Claim
19 words
A cathode according to claim 9, wherein the weight ratio of Ti to Na is from 2 to 2.5:1.
Claim 13
Dependent Claim
23 words
A cathode according to claim 8, wherein the weight ratio of the metal M to the non-stoichiometric compound is from 1 to 10:1.
Claim 14
Dependent Claim
18 words
A cathode according to claim 8, wherein the said cathode is a uniform solid and free of support.
Claim 15
Dependent Claim
18 words
A cathode according to claim 8, wherein said surface of said cathode is applied to a metal support.
Claim 16
Dependent Claim
22 words
A cathode according to claim 13, wherein the metal support is a metal of the group consisting of nickel, iron and steel.
Claim 17
Dependent Claim
38 words
A cathode according to claim 7, wherein the composition which makes up at least one active surface of said cathode has a ratio of bonding metal to non-stoichiometric compound which varies continuously from one side to the other.
Claim 18
Dependent Claim
58 words
An electrolytic cell for the electrolysis of an alkaline medium having a cathode comprising at least one surface of a binary mixture of (a) a metal of the group consisting of nickel, cobalt, and copper, and (b) another element of the group consisting of any preceding metal of group (a), titanium, lanthanides, and magnesium, or their hydrogenation products.
Claim 19
Dependent Claim
58 words
An electrolytic cell for the electrolysis of an alkaline medium having a cathode comprising at least one surface of a binary mixture of (a) a metal of the group consisting of nickel, cobalt, and copper, and (b) another element of the group consisting of any preceding metal of group (a), titanium, lanthanides, and magnesium, or their hydrogenation products.
Claim 20
Dependent Claim
19 words
An electrolytic cell according to claim 16, wherein the binary mixture is made up essentially of titanium and nickel.
Claim 21
Dependent Claim
22 words
An electrolytic cell according to claim 17, wherein the proportion of nickel atoms in the binary mixture is from 15 to 85%.
Claim 22
Dependent Claim
22 words
An electrolytic cell according to claim 17, wherein the proportion of nickel atoms in the binary mixture is from 15 to 40%.
Claim 23
Dependent Claim
22 words
An electrolytic cell according to claim 17, wherein the proportion of nickel atoms in the binary mixture is from 55 to 75%.
Claim 24
Dependent Claim
19 words
An electrolytic cell according to claim 16, wherein the said cathode is a uniform solid and free of support.
Claim 25
Dependent Claim
19 words
An electrolytic cell according to claim 16, wherein said surface of said cathode is applied to a metal support.
Claim 26
Dependent Claim
69 words
A process for the electrolysis of an alkali-metal chloride in an aqueous alkaline medium, employing an electrolytic cell equipped with a cathode, said cathode comprising at least one surface of a binary mixture of (a) a metal of the group consisting of nickel, cobalt, and copper, and (b) another element of the group consisting of any preceding metal of group (a), titanium, lanthanides, and magnesium, or their hydrogenation products.
Claim 27
Dependent Claim
69 words
A process for the electrolysis of an alkali-metal chloride in an aqueous alkaline medium, employing an electrolytic cell equipped with a cathode, said cathode comprising at least one surface of a binary mixture of (a) a metal of the group consisting of nickel, cobalt, and copper, and (b) another element of the group consisting of any preceding metal of group (a), titanium, lanthanides, and magnesium, or their hydrogenation products.
Claim 28
Dependent Claim
20 words
A process for electrolysis according to claim 23, wherein the binary mixture is made up essentially of titanium and nickel.
Claim 29
Dependent Claim
23 words
A process for electrolysis according to claim 24, wherein the proportion of nickel atoms in the binary mixture is from 15 to 85%.
Claim 30
Dependent Claim
23 words
A process for electrolysis according to claim 24, wherein the proportion of nickel atoms in the binary mixture is from 15 to 40%.
Claim 31
Dependent Claim
23 words
A process for electrolysis according to claim 24, wherein the proportion of nickel atoms in the binary mixture is from 55 to 75%.
Claim 32
Dependent Claim
20 words
A process for electrolysis according to claim 23, wherein the said cathode is a uniform solid and free of support.
Claim 33
Dependent Claim
20 words
A process for electrolysis according to claim 23, wherein said surface of said cathode is applied to a metal support.
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) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |