Patent ID: 6212769
Filing Date: 2001-04-10
Classification: C23F,H05K,Y10T

Abstract:
A method for fabricating a printed wiring board, comprising steps of:a) laminating a dielectric substrate to a surface-roughened metallic foil for embossing a surface of said dielectric substrate;b) removing said roughened metallic foil to expose said dielectric substrate embossed surface;c) forming at least one via in said dielectric substrate;d) applying a conditioning treating agent to said embossed surface and a via surface;e) applying a catalyst to said conditioned embossed surface and said conditioned via surface;f) electrolessly plating a uniform copper commoning layer on said catalyst conditioned embossed surface and conditioned via surface; said uniform copper commoning layer having a thickness no greater than 100 microinches;g) selectively plating on said uniform copper commoning layer of said catalyst conditioned embossed surface using photolithographic and semi-additive plating processes to generate multiple copper features and at least one fully plated via; said copper features and said fully plated vias being electrically connected to each other through said copper commoning layer; andh) etching said copper commoning layer to provide electrically isolated copper features and at least one said fully plated via.