EDA countersuit filed over simulation/emulation patent.

This article states that Cadence Design Systems, Magma Design Automation, Mentor Graphics and Altera jointly filed a countersuit against Vanguard Systems and venture capitalist Narpat Bhandari over a patent involving simulation and emulation. The complaint, filed in U.S. District Court for the Northern District of California, brings together a motley mix of co-defendants. It presents information on the issue involving the patent.