• Inter Partes Reviews (PTAB)
  • Patent Prosecution – U.S. & Int’l.
  • IP Litigation
  • Patent Clearances & Opinions
  • Technology Licensing
  • Transactions and M&A

Bar Admissions

  • Illinois
  • Michigan
  • N.D. Ill. Trial Bar

Admissions to Courts

  • U.S. Supreme Court
  • U.S. Court of Appeals for the Federal Circuit
  • U.S. Patent & Trademark Office


  • J.D., Chicago-Kent College of Law, 1998
  • M.B.A., Olivet Nazarene Univ., 1995
  • B.S. Computer Engineering, Univ. of Michigan, 1988

Professional Memberships

  • Illinois State Bar Association
  • Chicago Bar Association
  • Chicago Intellectual Property Alliance
  • Michigan Bar Association

Gregory B. Gulliver, J.D., M.B.A.



A founding member of AddyHart P.C. and a litigator experienced in trials in federal and state courts, Gregory Gulliver focuses his intellectual property practice on inter partes reviews at the USPTO’s Patent Trial and Appeals Board and other proceedings at the Patent Office. A licensed patent attorney, Gulliver also advises clients on a broad range of intellectual property advisory and litigation services, including domestic and international patent prosecution, opinion work, clearance, and strategies; and patent licensing, sale, and other transactions. He also advises on trademarks and copyrights, including licensing, and on business methods.

Gulliver is deeply experienced in commercial and intellectual property litigation relating to infringement involving complex electrical or software-based technologies. He regularly counsels clients on infringement and patent validity issues, as well as freedom-to-operate matters and conflict avoidance. He has prepared and prosecuted hundreds of patent applications in such diverse technical areas as cellular infrastructure and handsets, digital and analog circuitry, wireless communication base sites, RF, telephony, circuit-based telephone over cable, cable modems, network protocols, audio devices, CMOS imaging, semiconductors, big data processing, blockchain, GPS chips, hardware, software and software-based processes, and mechanical innovations. He also has experience in ex parte and advisory proceedings before the PTAB.

Gulliver’s professional experience includes nine years as a software engineer at Motorola, Inc., in its Cellular Infrastructure Group and its Multimedia, Information, and Messaging Sector, and at Bell Northern Research. His engineering expertise involved work on cellular and cable communication systems and handsets, as well as on various communication standards and network protocols. As a result of his strong technical background and vast patent prosecution experience, Gulliver is frequently retained to develop and manage patent portfolios involving various types of sophisticated technology. He uniquely combines engineering, law, and business acumen, enabling him to assist corporate clients in making strategic decisions regarding their intellectual property assets.

Prior to joining AddyHart P.C., Gulliver was a founding member of the Eclipse Group LLP. He also practiced intellectual property law at Sonnenschein, Nath & Rosenthal (now Dentons), and at Wildman Harrold Allen & Dixon (now Locke Lord). He is an editor of the Supplement for Chapter 10: Patents and the Internet in BNA’s IP Law in Cyberspace, which addresses patentable subject-matter under 35 U.S.C. §101, and he has served on conference panels discussing issues relating to inter partes reviews. He practices in our Chicago and Detroit offices.

  • Representative Litigation

    • Meta Platforms Inc. v. Thales Visionix, Inc. Represent patentee Thales Visionix, Inc. in defense of eight inter partes reviews filed by Meta Platforms Technologies on Thales’ portfolio of patents related to interactive gaming.
    • Jump Rope Systems LLC v. Coulter Ventures LLC d/b/a Rogue Fitness (S. Ct. 2022). Represented Fair Inventing Fund—a nonprofit inventor advocacy organization—as amicus curiae in support of Jump Rope’s petition for certiorari, asking the US Supreme Court do away with the Federal Circuit’s application of collateral estoppel to prevent a patent infringement suit brought on a patent previously held unpatentable at the PTAB and affirmed on appeal, because the “clear and convincing” standard required to invalidate a patent in the district court is materially higher than the “preponderance of evidence” standard applied in the PTAB.
    • Cradlepoint Inc., Dell Inc., Sierra Wireless, Inc. Thales DIS AIS Deutschland GmbH, ZTE Corp., & ZTE (USA) Inc. v. Sisvel International S.A. (PTAB). Represent global technology provider Thales DIS AIS in fifteen inter partes reviews of various claims relating to wireless solutions in patents of Luxembourg-based patent assertion entity Sisvel and its affiliate 3G Licensing S.A.
    • Wildcat Licensing WI LLC v. Atlas Copco and Assembly Systems, LLC, General Motors, LLC, Faurecia Automotive Seating, LLC and Magna Int’l Inc. (Fed. Cir. 2022). Represent appellant on appeal of a decision where the PTAB invalidated two Reissue patents related to automotive component manufacturing.
    • Navistar Inc. v. Fatigue Fracture Tech., LLC (PTAB pending). Represent respondent in inter partes review proceeding on patent for automotive part manufacturing process.
    • In re Fatigue Fracture Tech., LLC (PTAB). Represented patent owner on appeal of defense of ex parte reexamination relating to automotive part technology.