John Demarco


[email protected] / vCard

Pennzoil Place, 700 Milam Street, Suite 1300
Houston, TX 77002

P: 832-871-5058
F: 248-649-3338


  • Case Western Reserve University School of Law, J.D., 1995
  • Case Western Reserve Journal of International Law, Articles Editor; Nathan Burkan Memorial Copyright Writing Competition Award, 1995
  • Rensselaer Polytechnic Institute, B.S. Engineering Physics, 1989
  • Rensselaer Polytechnic Institute, B.S. German, 1989


  • State of Texas
  • State of Ohio
  • District of Columbia
  • United States Supreme Court
  • U.S. Courts of Appeals for the Federal, Fifth and Sixth Circuits
  • U.S. District Courts for the Northern, Eastern, Southern and Western Districts of Texas
  • U.S. District Court for the Northern and Central Districts of Illinois
  • U.S. District Courts for the Northern and Southern Districts of Ohio
  • U.S. District Court for the Western District of Wisconsin

Mr. Demarco focuses on patent and trademark counseling, licensing, litigation and prosecution. He helps companies acquire and develop technology and intellectual property, enforce/license intellectual property, design around patents, defend against patent assertions and structure international commercial activity to minimize infringement exposure.

Industry Experience

Mr. Demarco has litigated patent, copyright, trademark, trade secret, antitrust, false advertising and contract issues in courts in the U.S, Japan and Germany, as well as the U.S. International Trade Commission. Mr. Demarco’s technical experience is in electronics, software, optics, mechanics and chemicals, including: medical devices and imaging; robotics; automotive components; pharmaceuticals; petrochemicals; oil and gas drilling and flow systems; distributed computing; semiconductor component fabrication; and digital reading, storage, display, printing and camera devices.


Representative Patent Litigations

  • Mantissa Corp. v. Ondot Systems, Inc. et al.(S.D. Tex. and Fed. Cir.); Ondot Systems, Inc. v. Mantissa Corp. (N.D. Cal. and Fed. Cir.); Mantissa Corp. v. multiple banks in four cases (N.D. Ill. and C.D. Ill.) – lead and co-lead counsel for a software developer and patent owner in infringement cases; won a motion to dismiss for lack of personal jurisdiction.
  • Epos Technologies Ltd. v. Pegasus Technologies Ltd. (D.C.D.C. and Fed. Cir.) – represented a digital pen manufacturer and patent owner in an eight-year patent infringement case; won a reversal of summary judgment of noninfringement.
  • Represented and advised LED, RFID, microchip, camera, audiovisual-equipment, medical device, chemical, turbine-pump, and sports-equipment makers/sellers in over 25 patent infringement lawsuits filed by practicing entities.
  • Represented and advised defendants in the successful settlement/dismissal of over 25 patent infringement lawsuits filed by non-practicing entities.

Professional Activities

  • Rice Alliance for Technology and Entrepreneurship, Advisory Board Member, Rice University, Houston, Texas
  • University of Akron School of Law, Intellectual Property Advisory Council, Akron, Ohio
  • Owl Investment Group, Angel Investor, Texas


  • German