Plaintiffs-appellants eSpeed, Inc., Cantor Fitzgerald, L.P., CFPH, L.L.C. and eSpeed Government Securities, Inc. (collectively Cantor) appeal from the district court’s final judgment declaring claims 20-23 of United States Patent No. 6,560,580 (the ’580 patent) invalid, declaring the ’580 patent unenforceable, and entering final judgment in favor of defendants. Because we affirm the district court’s conclusion that the ’580 patent is unenforceable due to inequitable conduct, we need not decide the other issues raised by Cantor.
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