MANUFACTURING METHOD OF PRINTED-CIRCUIT BOARDS Russian patent published in 2012 - IPC H05K3/06 H05K3/36 H05K3/38 H05K3/42 

FIELD: electricity.

SUBSTANCE: method involves the following: prior to application of electroplated conductive copper coating to the fibre-glass plastic surface and to inner surface of bypass openings there applied is thin silver coating with thickness of 2÷4 mcm using the chemical method, silver salts, protected with polymer film or photoresist material; pattern of electroconductive scheme is formed, and after creation of electroconductive paths and electroplated metal coating of inner surface of bypass openings the protective polymer coating is removed and thin metal coating is etched from the sections not protected with metal resistive coating.

EFFECT: elimination of activation of fiber-glass plastic surface and holes using expensive palladium chloride; and elimination of power loss, especially at low currents, due to big difference in electric resistance of silver and palladium.