The Court of Appeals for the Federal Circuit in Mentor Graphics Corp. v. Eve-USA, Inc. was called upon to review litigation wherein Mentor asserted several patents against Synopsys, including U.S. Patent Nos. 6,240,376 ("the '376 patent"), 6,947,882 ("the '882 patent"), 6,009,531 … [Read more...] about Estoppel, Invalid Signal Claims and No Apportionment for Patent Infringement Profits