US4295951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film-coated cathodes for halate cells
Assignee: Occidental Chemical Corp
•
Filing: 1980-05-14
•
Granted: 1981-10-20
•
Expires: 2000-05-14
Abstract
Abstract A film-coated cathode is provided for the electrolysis of alkali metal halide solutions in the substantial absence of chromium ions. The cathode comprises a conductive substrate, such as titanium, steel, iron, or alloys thereof, coated with an adherent, porous film of a substantially nonconductive material having an average coating thickness of less than about 10 3 microns. The nonconductive, film-forming material is further characterized as being chemically inert in the halate solution.
Inventors
- 👤 Tilak V. Bommaraju
- 👤 Theodore H. Dexter
- 👤 Charles G. Rader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:42
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/24; C25B1/26; C25B1/265; C25B11/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A halate cell cathode for the production of alkali metal halates in the absence of chromium ions, said cathode comprising a conductive substrate coated with an adherent, porous flm of a substantially nonconductive, chemically inert material, said film having an average thickness of from about 10 -4 microns to about 10 3 microns an average porosity of from about 1% to about 85%, and an average pore size of from about 0.1 micron to about 30 microns.
Claim 2
Dependent Claim
77 words
A halate cell cathode for the production of alkali metal halates in the absence of chromium ions, said cathode comprising a conductive substrate coated with an adherent, porous flm of a substantially nonconductive, chemically inert material, said film having an average thickness of from about 10 -4 microns to about 10 3 microns an average porosity of from about 1% to about 85%, and an average pore size of from about 0.1 micron to about 30 microns.
Claim 3
Dependent Claim
13 words
The cathode of claim 1 wherein the conductive substrate is a ferrous material.
Claim 4
Dependent Claim
15 words
The cathode of claim 1 wherein the conductive substrate is titanium or an alloy thereof.
Claim 5
Dependent Claim
18 words
The cathode of claim 1 wherein an intermediate protective layer is provided between the film and the substrate.
Claim 6
Dependent Claim
20 words
The cathode of claim 1 wherein a layer of an electro-catalytic material is provided between the film and the substrate.
Claim 7
Dependent Claim
13 words
The cathode of claim 1 wherein the film material is a polymeric material.
Claim 8
Dependent Claim
13 words
The cathode of claim 6 wherein the polymeric material is a fluorocarbon polymer.
Claim 9
Dependent Claim
14 words
The cathode of claim 7 wherein the fluorocarbon polymer is a tetrafluoroethylene fluorocarbon polymer.
Claim 10
Dependent Claim
29 words
The cathode of claim 1 wherein the film material is an oxide of an element selected from the group consisting of titanium, iron, silicon, chromium, tantalum, hafnium and niobium.
Claim 11
Dependent Claim
12 words
The cathode of claim 9 wherein the metal oxide is chromic oxide.
Claim 12
Dependent Claim
97 words
In an electrolytic halate cell comprising a cell container, an anode, a cathode, and an alkali metal halate solution, the improvement comprising eliminating the presence of chromium ions in the solution by utilizing, as said cathode, a film-coated cathode comprising a conductive substrate coated with an adherent, porous film of a substantially nonconductive, chemically inert material, said film having an average thickness of from about 10 -4 microns to about 10 3 microns, an average porosity of from about 1% to about 85%, and an average pore size of from about 0.1 microns to about 30 microns.
Claim 13
Dependent Claim
97 words
In an electrolytic halate cell comprising a cell container, an anode, a cathode, and an alkali metal halate solution, the improvement comprising eliminating the presence of chromium ions in the solution by utilizing, as said cathode, a film-coated cathode comprising a conductive substrate coated with an adherent, porous film of a substantially nonconductive, chemically inert material, said film having an average thickness of from about 10 -4 microns to about 10 3 microns, an average porosity of from about 1% to about 85%, and an average pore size of from about 0.1 microns to about 30 microns.
References Cited (Backward Citations)
FR1490168A
Cited
USRE29419E
Cited
SU445947A1
Cited
US4086155A
Cited
US4101395A
Cited
US4197178A
Cited
US4151052A
Cited
US4118294A
Cited
US4235695A
Cited
US4217195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |