Attorneys William P. O’Sullivan

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shareholder | Manchester, NH

Bill is a member of the firm’s intellectual property group. His practice emphasizes patent prosecution and counseling, patent strategy and analysis, and development and management of patent portfolios. Bill has technical expertise in electrical, mechanical, optical and software technologies. He has spoken on patent law topics in a variety of academic and business settings.

Prior to joining the firm, Bill was a Principal in the New York office of Fish & Richardson, P.C. He also spent several years working as an electrical engineer and engineering project manager.


  • State of New Hampshire
  • State of New York
  • State of New Jersey
  • U.S. Patent & Trademark Office

Civic Involvement

  • Arthur J. Gajarsa American Inn of Court


  • Rising Star by New England Super Lawyers®, Intellectual Property