Nos. 2014-1516, 2014-1530.

814 F.3d 1309 (2016)

SYNOPSYS, INC., Appellant v. MENTOR GRAPHICS CORPORATION, Cross-Appellant, Michelle K. Lee, Director, U.S. Patent and Trademark Office, Intervenor.

United States Court of Appeals, Federal Circuit.

February 10, 2016.

Attorney(s) appearing for the Case

Eric Shumsky , Orrick, Herrington & Sutcliffe LLP, Washington, DC, argued for appellant. Also represented by Jeremy Peterman ; Indra Neel Chatterjee , Travis Jensen , Cam Thi Phan , Menlo Park, CA; George Laszlo Kanabe , San Francisco, CA; Andrew D. Silverman , New York, NY; William H. Wright , Los Angeles, CA.

Mark E. Miller , O'Melveny & Myers LLP, San Francisco, CA, argued for cross-appellant. Also represented by George Alfred Riley ; Christopher Lewis McKee , Michael Steven Cuviello , Bradley Charles Wright , Banner & Witcoff, Ltd., Washington, DC; Kevin F. King , Robert Allen Long, Jr. , Covington & Burling LLP, Washington, DC.

Scott Weidenfeller , Office of the Solicitor, United States Patent and Trademark Office, Alexandria, VA, argued for intervenor. Also represented by Nathan K. Kelley , Jamie Lynne Simpson .

Jennifer Loraine Swize , Jones Day, Washington, DC, for amicus curiae SAS Institute, Inc. Also represented by John S. Sieman .

Opinion for the court filed by Circuit Judge DYK. Dissenting opinion filed by Circuit Judge NEWMAN.

Synopsys, Inc. ("Synopsys"), the petitioner, appeals a final decision of the Patent Trial and Appeal Board ("Board") in an inter partes review of claims of U.S. Patent No. 6,240,376 ("the '376 patent"). Mentor Graphics Corporation ("Mentor"), the patent owner, cross appeals. The Board found that...

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