Electrode coating process
Patent 4112140 Issued on September 5, 1978. Estimated Expiration Date: 
April 14, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 14, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3632498 3711385 3773554 3776834 3869312 InventorsApplicationNo. 05/787418 filed on 04/14/1977US Classes:427/126.5, Metal is Au, Ag, Pt, Pd, Ru, Rh, Os, Ir427/380Metal or metallic compound containing coatingExaminersPrimary: Weiffenbach, Cameron K.Attorney, Agent or FirmInternational ClassesC25B 11/00 (20060101)C25B 11/04 (20060101) AbstractA method to produce an electrode by coating at least a portion of a valve metal substrate sequentially with first and second liquid solutions containing different proportions of dissolved ruthenium and valve metal values; the second solution having a greater valve metal to ruthenium weight ratio than the first solution. At least a portion of the substrate is contacted with a first liquid solution containing ruthenium and the valve metal in amounts of from about 1 to about 50 milligrams per milliliter of the solution. The weight ratio of the valve metal to ruthenium in the first solution is from about 1:4 to about 2:1. The so-contacted surface is heated to oxidize the deposited ruthenium and valve metal values. Thereafter at least the oxidized surface is contacted with a second solution containing dissolved valve metal and ruthenium values in a weight ratio of from about 20:1 to about 2:1 and heated to oxidize the deposited metal values. | |
