Chemistry: electrical and wave energy – Apparatus – Electrolytic
Reexamination Certificate
2006-06-06
2006-06-06
Bell, Bruce F. (Department: 1746)
Chemistry: electrical and wave energy
Apparatus
Electrolytic
C204S272000, C204S283000, C205S316000, C205S333000, C205S539000, C029S746000
Reexamination Certificate
active
07056424
ABSTRACT:
In order to regenerate permanganate solutions being utilized for the etching and roughening of plastics surfaces electrolytic methods are known. Though relatively small quantaties of by-products are produced with these methods as compared to chemical regeneration methods, large quantaties of manganese dioxide are produced when printed circuit boards are treated. In order to avoid formation of manganese dioxide during the regeneration method a novel cathode2has been found which is provided with a porous, electrically nonconducting layer7on the cathode body3. The layer7preferably consists of a plastics material being resistant to acid and/or alkali.
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W.P. Innes, Electrolytic Regeneration of Chromic Acid Etchants, Nov. 1978,5 pages.
De Boer Reinhard
Dünnebeil Sebastian
Atotech Deutschland GmbH
Bell Bruce F.
Paul & Paul
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