Patent ID: 9380700
Filing Date: 2016-06-28
CPC Classification: H05K

Claim Text:
1. A method for forming a printed circuit board, comprising: forming a printed circuit board laminate substrate from a glass cloth impregnated with resin and catalytic material that is pressed together using vacuum laminating equipment, the printed circuit board laminate substrate having a top surface and having a bottom surface, the catalytic material resisting metal plating except where the top surface is broken and where the bottom surface is broken; forming trace channels in the top surface of the printed circuit board laminate substrate and in the bottom surface of the printed circuit board laminate substrate, wherein the channels are formed below the top surface of the printed circuit board laminate substrate and below the bottom surface of the printed circuit board laminate substrate; immersing the laminate substrate in a metal bath so that metal plates within the trace channels but not on other portions of the top surface of the printed circuit board laminate substrate and not on other portions of the bottom surface of the printed circuit board laminate substrate; planarizing the top surface and the bottom surface so that metal plated within the trace channels is flush with a surface of the laminate substrate; and forming at least one through via that extends from the top surface of the printed circuit board laminate substrate to the bottom surface of the printed circuit board laminate substrate.