US4414071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode
Assignee: Johnson Matthey PLC
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Filing: 1981-04-15
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Granted: 1983-11-08
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Expires: 2001-04-15
Abstract
Abstract An electrode for use as a cathode in a chloralkali cell or a water electrolysis cell comprises an electrically-conductive matrix having a very low metal loading surface electrocatalytic noble metal-containing deposit which may be prepared by a displacement deposition technique.
Inventors
- 👤 Donald S. Cameron
- 👤 Susan J. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:28
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/097; C25B11/052; C25B11/075; C25B11/081; C25B11/093; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A cathode suitable for use in a chloralkali process, the cathode comprising an electrolytic deposit of platinum and ruthenium having a roughness factor of at least 100 cm 2 /cm 2 of geometric surface area, wherein the deposit is carried on an electrically conductive matrix and is selected from a group consisting of mixtures or alloys of platinum and ruthenium.
Claim 2
Dependent Claim
60 words
A cathode suitable for use in a chloralkali process, the cathode comprising an electrolytic deposit of platinum and ruthenium having a roughness factor of at least 100 cm 2 /cm 2 of geometric surface area, wherein the deposit is carried on an electrically conductive matrix and is selected from a group consisting of mixtures or alloys of platinum and ruthenium.
Claim 3
Dependent Claim
11 words
A cathode according to claim 1 wherein the deposit comprises dendrites.
Claim 4
Dependent Claim
30 words
A cathode according to claim 1 wherein the deposit is present in a loading of from 0.01 to 10 mg/cm 2 of the surface area of the electrically conductive matrix.
Claim 5
Dependent Claim
17 words
A cathode according to claim 3 wherein the loading is from 0.03 to 5 mg/cm 2 .
Claim 6
Dependent Claim
11 words
A chloralkali cell incorporating a cathode as claimed in claim 1.
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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |