Patent ID: 9456507
Filing Date: 2016-09-27
CPC Classification: B29C,B29K,H05K,Y10T

Claim Text:
1. A method for fabrication of a circuit board comprising: preparing a Computer Aided Design (CAD) model of a multilayer circuit board with conductive elements defined by layer for a plurality of layers; introducing a first granular conductive material layer into a mold; traversing a laser sintering head across the mold to sinter selected portions of the first granular conductive material layer forming first layer conductive elements as defined by the CAD model for a first layer in the plurality of layers; introducing an additional granular conductive material layer into the mold over the sintered selected portions of the first layer and un-sintered portions of the first layer; traversing the laser sintering head across the mold to sinter selected portions of the additional granular conductive material layer forming additional layer conductive elements as defined by the CAD model for an additional layer in the plurality of layers, the traversing speed and laser sintering power controlled to avoid fusing of un-sintered material in the first layer; removing un-sintered granular conductive material from the sintered first conductive elements and additional conductive layer elements, wherein the step of removing un-sintered granual conductive material comprises pneumatic purging; infusing a dielectric material into a structure formed by the sintered first conductive elements and additional conductive layer elements to fill space from which the un-sintered granular conductive material was removed.