Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1990-11-16
1993-09-28
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204107, 204108, 204130, 156642, 156656, 156666, 134 10, 134 13, C25C 112
Patent
active
052483983
ABSTRACT:
A novel bipolar cell is described together with a method for employing the same in the electrowinning of heavy metals (copper, nickel, cobalt and the like) from baths such as etchants, electroless plating baths and the like. In a particular application, the bipolar cell is used to regenerate a chloride-based ammoniacal copper etching bath by electrowinning a portion of the copper therein. The regeneration is accomplished without generating any significant amount of gaseous chlorine. The regeneration of the copper etching bath in this manner is used in a closed loop system for maintaining at a substantially constant level the amount of copper present in an operating ammoniacal chloride copper etchant bath.
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patent: 4564428 (1986-01-01), Furst
patent: 4772365 (1988-09-01), Haas
patent: 4784785 (1988-11-01), Cordani et al.
patent: 4915776 (1990-11-01), Lee
patent: 4957611 (1990-09-01), Collini
patent: 5085730 (1992-02-01), Cordani
MacDermid Incorporated
Niebling John
Ryser David G.
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