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William J. Mostyn IV

William J. Mostyn IV

Patent and Trademark Attorney
  • Intellectual Property, Patents, Trademarks ...
  • Massachusetts, United States Patent and Trademark Office
Claimed Lawyer Profile

William J. Mostyn is a Registered Patent Attorney with over 13 years of experience in the technology industry. Prior to founding Mostyn IP, he was an Associate at Cesari and McKenna LLP, a Boston-based intellectual property law firm. Mr. Mostyn has successfully prosecuted patents for individuals and large international corporations. His broad technological experience includes chemical, electrical and mechanical technologies, such as medical and dental devices, spectroscopy, small molecules, ion selective electrodes and wastewater treatment. He has also successfully represented clients in federal district, state district and state appellate courts. Prior to practicing law, Attorney Mostyn was a Clinical Research Coordinator at Boston Medical Center Hospital, a Research and Development Chemist at a small biotech company in Massachusetts, and an intern at the world-renowned Department of Biochemistry at University College Cork in Cork, Ireland, where he investigated the role of caspase-9 in cell apoptosis. Mr. Mostyn studied biochemistry as an undergraduate student and biochemistry, immunology, endocrinology, physiology and histology as a graduate student. REPRESENTATIVE LITIGATION MATTERS Savant Sys., LLC v. Crestron Elecs., Inc. (D. Mass.) Crestron Elecs., Inc. v. Cyber Sound & Security, Inc. (D.N.J.) Lee Valley Tools, LTD. et al. v. Industrial Blade Company (W.D.N.Y.) Shea v. Trustees of Tufts University (Mass. App. Ct.) Medical Monofilament Manufacturing, LLC v. J-Tech Automation, Inc. (Mass. Dist. Ct.)

Northeastern University School of Law
J.D. (2010) | Law
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Boston University
M.A. (2006) | Medical Sciences
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Ohio Wesleyan University
B.A. (2003) | Biochemistry, Pre-Medicine
Honors: Julien Higley Prize in Chemistry Dean's List
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Professional Experience
Mostyn IP, LLC
- Current
Cesari and McKenna LLP
Contract Patent Attorney
Genzyme Corporation
Owner & Patent Attorney
Law Office of William J. Mostyn
Clinical Research Coordinator
Boston Medical Center Hospital
Cytosol Laboratories, Inc.
Rising Star 2019
Massachusetts Super Lawyers
Rising Star 2018
Massachusetts Super Lawyers
Rising Star 2017
Massachusetts Super Lawyers
Professional Associations
Massachusetts State Bar
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Boston Patent Law Association
- Current
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Boston Bar Association
- Current
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Jurisdictions Admitted to Practice
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United States Patent and Trademark Office
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  • Free Consultation
    Free initial consultation.
  • Credit Cards Accepted
Practice Areas
  • Intellectual Property
  • Patents
  • Trademarks
  • Antitrust Law
  • Business Law
Websites & Blogs
Mostyn IP, LLC
Contact & Map
Mostyn IP, LLC
Main Office
One International Place
Suite 1400
Boston, MA 02110
Telephone: (857) 400-7414
Fax: (617) 463-9251
Mostyn IP, LLC
Additional Mailing Address
P.O. Box 278
Quincy, MA 02171