Cadence Design Systems filed suit against OEA International over five patents related to electronic design automation of integrated circuits.  Cadence also filed an action for declaratory judgment against Lonestar Inventions [NPE] over a patent related to high capacitance structures in semiconductors.  Lonestar has filed 10 prior suits since January 2007 against defendants including AMD, Freescale, Kodak, Matsushita Nintendo, NVIDIA, Panasonic, Sandisk, Sony, and Xilinx.  10/11, Eastern District of Texas, 6:2011cv00532.