Charles M. McMahon - McDermott Will & Emery


Charles (Charlie) McMahon focuses his practice on patent, trademark, copyright and unfair competition law. Charlie has represented domestic and multinational clients in federal courts and before the US Patent and Trademark Office, the US Patent Trial and Appeal Board (PTAB), the International Trade Commission (ITC), the US Court of Appeals for the Federal Circuit and the US Supreme Court.

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  • InterDigital v. ZTE (D. Del. 2015); led a trial team to a favorable defense jury verdict in this case involving wireless communication technology
  • ZTE v. InterDigital (PTAB 2015); served as lead counsel in a successful inter partes review proceeding, in which the Patent Trial and Appeal Board cancelled claims that had previously survived a jury validity verdict
  • Technology Properties Limited v. ZTE (N.D. Cal. 2015); defended a manufacturer of wireless communication devices in this patent infringement action, which resulted in a favorable claim construction ruling and a stipulation of non-infringement

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  • The Legal 500, 2017 to present
  • The Best Lawyers in America, Patent Litigation, 2024

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  • American Bar Association, Intellectual Property Law Section
  • American Intellectual Property Law Association
  • Licensing Executives Society

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George Washington University Law School, JD, 1999
University of Notre Dame, BS, Electrical Engineering, 1996


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