Who We Are

John T. Callahan

John Callahan is a partner in Sughrue's Washington, DC office. His practice includes all aspects of Intellectual Property law, with a particular focus on ‎district court litigation and post-grant proceedings before the Patent Trial and Appeal Board of the U.S. ‎Patent and Trademark Office. In addition to his litigation and practice before the PTAB, Mr. Callahan counsels a variety of international and domestic clients regarding U.S. IP law, ‎including providing clearance, enforceability and validity opinions. He also counsels clients on licensing ‎matters and assists clients in the procurement of both U.S. and foreign patents. Mr. Callahan’s experience also ‎includes the specialized U.S. practice of inter partes review, post-grant review, ex parte reexamination and reissue.

Mr. Callahan’s practice has encompassed a wide range of technologies in the chemical, biotechnology, ‎mechanical and electrical arts, including pharmaceuticals, batteries, food chemistry, medical devices, polymers, ‎catalysts, glass products, semiconductor devices and electronic circuitry. Mr. Callahan has lectured widely ‎on U.S. IP law, particularly on the USPTO's post grant procedures implemented pursuant to the America Invents ‎Act. He has lectured in the United States, Europe, Korea, Japan, India and China on topics including ‎strategies relating to post-grant proceedings at the USPTO, what constitutes ‎prior art under the America Invents Act, opinion writing, generic drug litigation, case law from the U.S. Court ‎of Appeals for the Federal Circuit, claim drafting for biotech inventions, reexamination, interferences, the ‎doctrine of equivalents and changes in U.S. patent laws and procedures.‎ A recent presentation on IPR proceedings entitled "PTAB: Success by the Numbers" can be viewed on YouTube at the URL address: https://www.youtube.com/watch?v=jv6PMNJA8vE.

Professional Recognition:

  • Recognized among Managing Intellectual Property's IP Stars USA, 2017 for expertise in patent prosecution and litigation