Patent ID: 7470990
Filing Date: 2008-12-30
Classification: H01L,H05K

Abstract:
1. A circuitized substrate comprising: a first dielectric sub-layer including a low moisture absorptivity resin and a plurality of fibers having a low coefficient of thermal expansion, said first dielectric sub-layer including first and second opposing surfaces; first and second circuitized layers located on said first and second opposing surfaces of said first dielectric sub-layer, respectively; second and third dielectric sub-layers located on said first and second circuitized layers, respectively, each of said second and third dielectric sub-layers also of a low moisture absorptivity resin, said second and third dielectric sub-layers not including continuous or semi-continuous fibers as part thereof; third and fourth circuitized layers positioned on said second and third dielectric sub-layers, respectively; and a highly dense pattern of thru-holes extending through said first, second and third dielectric sub-layers and said first, second, third and fourth circuitized layers.