Patent ID: 7348677
Filing Date: 2008-03-25
Classification: H01L,H05K

Abstract:
1. A method of making a multilayered printed circuit board, said method comprising: providing a first dielectric layer having first and second opposing sides; forming a first conductive layer on said first opposing side of said first dielectric layer; forming a second conductive layer on said second opposing side of said first dielectric layer, said second conductive layer including at least one opening therein; forming a second dielectric layer having first and second opposing sides on said second conductive layer on said second opposing side of said first dielectric layer, said first opposing side of said second dielectric layer being in contact with at least part of said second conductive layer including over said at least one opening therein; forming at least two holes within said second dielectric layer, one of said holes extending down to only said second conductive layer and the other of said holes extending through said at least one opening in said second conductive layer and down to said first conductive layer; forming a third conductive layer on said second opposing side of said second dielectric layer; forming a conductive coating on the surfaces of said at least two holes so as to electrically couple said first and second conductive layers with said conductive coating on said one of said holes and said second and third conductive layers with said conductive coating on said other of said holes; and filling each of said at least two holes having said conductive coatings thereon with paste.