John Harrity has been involved in the patent field for 20 years. His current practice consists primarily of client counseling, and preparing and prosecuting patent applications. John has drafted and prosecuted hundreds of patent applications in a wide variety of electrical, mechanical, and electromechanical technologies. He excels at coming up to speed quickly on inventions and converting even the most difficult inventions into an understandable patent application. John’s practice further includes filing PCT applications and prosecuting patent applications before the Patent Offices in Europe, Japan, Korea, China, Canada, and many other countries. In addition to drafting and prosecuting patent applications in the United States and foreign countries, he also analyzes inventions for infringement and validity.

Prior to forming Harrity & Harrity, John worked as a law clerk at Burns, Doane, Swecker & Mathis, LLP. He also was a Primary Patent Examiner at the United States Patent and Trademark Office. At the Patent Office, John examined patent applications in the areas of computer hardware and software.

Prior to joining the Patent Office, John worked as an Electrical Engineer for 3 years at Cortana Corporation, where he participated in, and supervised Navy projects directed to advanced submarine technologies. His engineering experience included design and development of noise-cancellation technology, an automated submarine emergency system, and future submarine power systems.




Phone: 571-432-0800

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The Columbus School of Law at Catholic University
(J.D.) – 1999

Grove City College
(B.S. Electrical Engineering) – 1989


United States Patent and Trademark Office


Panelist. “Building an Exceptional Law Firm Culture,” Managing Partner Forum (August 2021).


Executive Leadership Board Member- Lawyers Have Heart
Institute of Electrical and Electronics Engineers
Intellectual Property Owners Association (IPO)
Leadership Council on Legal Diversity
Virginia State Bar Association


2018 IAM Patent 1000 – Top Patent Professional

2016 Client Choice Award – Excellence In Client Service