US4300992A
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US
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Activated cathode
Assignee: Hodogaya Chemical Co Ltd
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Filing: 1976-05-04
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Granted: 1981-11-17
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Expires: 1996-05-04
Abstract
Abstract Activated cathode for use in aqueous solution electrolysis comprises (a) a base plate made of a metal selected from the group consisting of titanium, tantalum, zirconium, niobium or an alloy essentially consisting of combination of those metals and (b) a metal oxide layer formed on the surface of the base plate, said metal oxide essentially consisting of an oxide of one or more metal elements selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum in the groups VIII-5 and VIII-6 of the periodic table and if necessary, (c) an oxide of one or more metal elements selected from the group consisting of calcium, magnesium, strontium, barium and zinc in the group II and chromium, molybdenum, tungsten, selenium and tellurium in the group VI.
Inventors
- 👤 Hiroyuki Yoshida
- 👤 Toshitada Akazawa
- 👤 Tadayosi Haneda
- 👤 Kenzi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:35
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
An electrolytic cell comprising an activated cathode, an anode and an aqueous solution of an electrolyte, said activated cathode comprising: (a) a base plate selected from the group consisting of titanium, tantalum, zirconium, niobium and an alloy essentially consisting of a combination of those metals; (b) an activated layer of at least one metal oxide selected from the group consisting of oxides of a metal element selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum, formed on the surface of the base plate (a); and (c) a reduction inhibiting layer of at least one other oxide selected from the group consisting of oxides of an element selected from the group consisting of magnesium, calcium, strontium, barium, zinc, selenium, tellurium, chromium, molybdenum and tungsten formed on the surface of the activated layer of metal oxide (b).
Claim 2
Dependent Claim
139 words
An electrolytic cell comprising an activated cathode, an anode and an aqueous solution of an electrolyte, said activated cathode comprising: (a) a base plate selected from the group consisting of titanium, tantalum, zirconium, niobium and an alloy essentially consisting of a combination of those metals; (b) an activated layer of at least one metal oxide selected from the group consisting of oxides of a metal element selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum, formed on the surface of the base plate (a); and (c) a reduction inhibiting layer of at least one other oxide selected from the group consisting of oxides of an element selected from the group consisting of magnesium, calcium, strontium, barium, zinc, selenium, tellurium, chromium, molybdenum and tungsten formed on the surface of the activated layer of metal oxide (b).
Claim 3
Dependent Claim
28 words
An electrolytic cell according to claim 1 wherein in the activated cathode the thicknesses of the activated layer (b) and the reduction inhibiting layer (c) are 0.5-50 microns.
Claim 4
Dependent Claim
17 words
An electrolytic cell according to claim 1 wherein in the activated cathode the base plate is titanium.
Claim 5
Dependent Claim
30 words
An electrolytic cell according to claim 1 wherein in the activated cathode layer (b) consists of said metal oxide or oxides and layer (c) consists of said oxide or oxides.
Claim 6
Dependent Claim
17 words
An electrolytic cell according to claim 1 wherein in the activated cathode the base plate is titanium.
Claim 7
Dependent Claim
19 words
An electrolytic cell according to claim 1 wherein in the cathode layer (b) consists of said oxide or oxides.
Claim 8
Dependent Claim
64 words
An electrolytic cell according to claim 1 wherein in the activated cathode the shape thereof is in the form of a: (i) plate, (ii) sheet, (iii) plate or sheet having number of apertures formed therein, (iv) mesh or expanded metal, (v) grille or (vi) a box-type or cylindrical body including mesh, grille or punched metal which is welded to plate, pipe, rod or rib.
Claim 9
Dependent Claim
22 words
An electrolytic cell according to claim 1 wherein in the activated cathode the thickness of the activated layer (b) is 0.5-50 microns.
Claim 10
Dependent Claim
129 words
An activated cathode for use in the aqueous solution electrolysis comprising: (a) a base plate selected from the group consisting of titanium, tantalum, zirconium, niobium and an alloy essentially consisting of a combination of those metals; (b) an activated layer of at least one metal oxide selected from the group consisting of oxides of a metal element selected from the group consising of ruthenium, rhodium, palladium, osmium, iridium and platinum, formed on the surface of the base plate; and (c) a reduction inhibiting layer of at least one other oxide selected from the group consisting of oxides of an element selected from the group consisting of magnesium, calcium, strontium, barium, zinc, selenium, tellurium, chromiun, molybdenum and tungsten formed on the surface of the activated layer of metal oxide (b).
Claim 11
Dependent Claim
129 words
An activated cathode for use in the aqueous solution electrolysis comprising: (a) a base plate selected from the group consisting of titanium, tantalum, zirconium, niobium and an alloy essentially consisting of a combination of those metals; (b) an activated layer of at least one metal oxide selected from the group consisting of oxides of a metal element selected from the group consising of ruthenium, rhodium, palladium, osmium, iridium and platinum, formed on the surface of the base plate; and (c) a reduction inhibiting layer of at least one other oxide selected from the group consisting of oxides of an element selected from the group consisting of magnesium, calcium, strontium, barium, zinc, selenium, tellurium, chromiun, molybdenum and tungsten formed on the surface of the activated layer of metal oxide (b).
Claim 12
Dependent Claim
24 words
An activated cathode according to claim 9 wherein the thicknesses of the activated layer (b) and the reduction inhibiting layer (c) are 5-50 microns.
Claim 13
Dependent Claim
13 words
An activated cathode according to claim 9 wherein the base plate is titanium.
Claim 14
Dependent Claim
26 words
An activated cathode according to claim 9 wherein layer (b) consists of said metal oxide or oxides and layer (c) consists of said oxide or oxides.
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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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |