METHOD AND DEVICE FOR THE ATTACK OF MASK COPPER WITH A NICKEL-GOLD MASK

摘要

THE INVENTION CONCERNING THE MANUFACTURE OF PRINTED CIRCUITS IN A COPPER ANISOTROPIC ATTACK OPERATION THROUGH A NICKEL-GOLD MASK, IT IS ESTABLISHED AN ELECTRICAL CONNECTION 26 BETWEEN THE COPPER OF A PRINTED CIRCUIT 11 AND WALL 27 OF THE REACTION CHAMBER 21, OR ANY OTHER ELECTRICAL CONDUCTOR WITH WHICH THE ATTACK SOLUTION COMES IN CONTACT. THUS AVOID A LATERAL SURGRAVURE OF COPPER BELOW THE NICKEL-GOLD MASK. / P P APPLICATION TO ELECTRONICS. / P