Chris Katsantonis is a member of the firm’s Intellectual Property practice group, focusing on drafting and prosecuting patent applications, freedom-to-operate evaluations, due diligence investigations, opinion work and litigation. While Chris’ background is in electrical engineering, he has experience counseling clients on all aspects of patent law, including applications in the electrical, mechanical and computer technology areas.

Licensed to practice before the U.S. Patent and Trademark Office (USPTO), Chris formulates and communicates prosecution and litigation strategies with clients to ensure the robust protection of IP assets and entire portfolios. Chris has experience responding to USPTO office actions concerning obviousness, indefiniteness, patentable subject matter and novelty issues. He has also conducted extensive legal research and prior art searches, as well as created claim charts providing invalidity analysis for inter partes review proceedings before the USPTO.

To assist his clients in staying abreast of recent developments in the law, Chris also regularly drafts memoranda pertaining to USPTO, Patent Trial and Appeal Board, and district court case law, proceedings and statutory amendments.


Prior to joining Armstrong Teasdale, Chris worked at an intellectual property law firm in Washington, D.C., and also served as a legal intern to an international membership organization where he worked to improve patent quality and deter unsubstantiated or invalid patent assertions in specific technology areas.

In addition, Chris worked as a Port Authority Trans-Hudson (PATH) Engineering Intern for the Port Authority of New York and New Jersey. In this role, he collaborated with architects, engineers and construction managers to inspect and evaluate damage to rail lines as a result of Hurricane Sandy, and assessed the compatibility and integration of a multimillion-dollar fire alarm system upgrade with new fiber optic network systems for 100 PATH structures.


  • American University Washington College of Law  (J.D., 2020)
    • Mock Trial Honor Society
    • Highest Grade Designation, Patent Prosecution (Spring 2019); Patent Law (Fall 2018)
    • American University Business Law Review (Staff Member)
  • Pennsylvania State University  (B.S., 2017)
    • Electrical Engineering


  • Pennsylvania
  • U.S. Patent and Trademark Office

Professional Activities

  • American Bar Association, Intellectual Property Law Section
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