Practice Areas



  • U.S Court of Appeals for the Ninth Circuit, 2001
  • U.S Court of Appeals for the Federal Circuit, 2001
  • U.S. District Court, District of Connecticut, 2000
  • U.S Patent and Trademark Office, 2000 
  • U.S. District Court, District of Massachusetts, 1997
  • Commonwealth of Massachusetts, 1997
  • State of Connecticut, 1997


Western New England School of Law, J.D., 1997

Northeastern University, B.S., Mechanical Engineering, 1993

Teaching Positions

  • Adjunct Professor, University of Connecticut School of Law
Photo of Charles F. O

Charles F. O'Brien

Partner and Chair of the IP Transactional Practice
860.286.2929, ext. 1159

Charlie O'Brien is the Chair of Cantor Colburn’s IP Transactional Practice Group. He concentrates his transactional practice on the exploitation, transfer and licensing of technology. Charlie has extensive experience in all aspects of complex IP licensing, including the preparation and negotiation of patent license agreements, software license agreements, joint development agreements, trademark license agreements, material transfer agreements, joint marketing and promotion agreements, and the like. Charlie is also a member of Cantor Colburn’s Litigation Department and has extensive experience in litigating IP related actions, including patent infringement actions and contractual disputes regarding IP rights. These skills provide him with useful and sometimes critical insight for his clients into issues and conflicts that can arise in IP transactional matters. This allows him to address these potential issues and conflicts early on at the transactional stage.

Experience Highlights

Partner, Cantor Colburn LLP, 2006-present

Associate, Cantor Colburn LLP, 1999-2006

Associate, Pelligrini, Seeley, Ryan and Blakesley, Springfield, MA, 1997-1999

Law Clerk, Pelligrini, Seeley, Ryan and Blakesley, Springfield, MA, 1995-1997




Professional Affiliations

American Bar Association

Connecticut Bar Association

Federal Circuit Bar Association

Intellectual Property Owners Association (IPO)

  • IP Licensing & Related Issues Committee
  • Open Source Committee

Licensing Executives Society


Community/Civic Involvement

Board of Directors, Connecticut Invention Convention