3D Design Solutions [NPE] filed suit against Cadence Design Systems and STMicroelectronics, alleging that the defendants’ Encounter Digital Implementation systems infringe a patent related to 3D design of integrated circuits.  This is the first patent infringement suit initiated by 3D Design Solutions, a subsidiary of Acacia Research Group.  Lisa McIlrath is the named inventor on the patent-in-suit, which she assigned to R3 Logic in December 2008. According to the complaint, Acacia is the exclusive licensee of the in-suit-patent.  2/29, Northern District of Texas, 3:2012cv00625.