Thomas J. Engellenner

Thomas J. Engellenner


Boston, MA
Phone: 617.204.5189    Fax: 617.204.5150

Mr. Engellenner’s experience includes:

  • counsel in numerous inter partes review (IPR) proceedings at the U.S. Patent Office, successfully arguing on behalf of patent owners in several IRPs that a trial should not be initiated
  • participation in numerous U.S. patent reexamination proceedings and European patent oppositions on behalf of life science and high tech clients
  • design of a patent strategy and portfolio development for the first company to secure FDA approval in the U.S. for laser vision correction devices; also was a member of the trial team that secured a multi-million dollar jury verdict in a patent infringement suit against a competitor based on one of the patents he drafted
  • obtained summary judgment of invalidity for life science company accused of patent infringement
  • outside IP counsel for world-famous institute of regenerative medicine
  • representation of a client as defendant accused of patent infringement in an International Trade Commission proceeding and secured a judgment that no exclusion order was warranted based on public interest factors
  • representation of a life science company in a Federal Trade Commission antitrust investigation that resulted in a dismissal without penalties or admission of wrongdoing
  • assisting a life science client in a sale of its catheter business to a major medical device company, including term sheet negotiation, due diligence and final asset purchase agreement.


  • J.D., Boston University School of Law
  • M.S., Environmental Studies, Rensselaer Polytechnic Institute
  • B.S., Engineering, Rensselaer Polytechnic Institute

Bar Admissions

  • U.S. Patent and Trademark Office
  • Massachusetts
  • New York

Court Admissions

  • U.S. Court of Appeals, Federal Circuit
  • U.S. District Court, District of Massachusetts

Practice Areas

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