William P. O'Sullivan

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William P. O'Sullivan

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Phone: 603.627.8186
Fax: 603.627.8121
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Practice Focus

Bill is a member of the firm's intellectual property group. He provides strategic counseling on a broad range of intellectual property issues, with an emphasis on patent prosecution and related counseling on inventions relating to electrical, mechanical, optical and software technologies for domestic and international clients. Bill’s practice also involves due diligence studies, freedom-to-operate investigations, and infringement and validity opinions, as well as post-grant challenges to the validity of issued patents.

Bill has spoken on patent law as it relates to medical device development at the Dartmouth Thayer School of Engineering and on patent law more generally at Southern New Hampshire University.

Bill’s practice also involves trademark prosecution and related counseling.

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 an engineering project manager.


B.E., Maritime College, State University of New York
J.D., Rutgers Law School


Bill has been named a Rising Star by New England Super Lawyers® for his work in Intellectual Property.

Memberships and Admissions

Bill is admitted to practice in New Hampshire, New York and New Jersey and is registered to practice before the U.S. Patent & Trademark Office.

Practice Areas
Intellectual Property and Technology

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