A substrate of multilayered structure having a plurality of sets of an insulation layer and a wiring line layer, and having one face for mounting a semiconductor element thereon and the other face on which external connection terminals are to be provided, the face for mounting a semiconductor element...http://www.google.com.au/patents/US6441314?utm_source=gb-gplus-sharePatent US6441314 - Multilayered substrate for semiconductor device
