John J. Feldhaus

Retired Partner


John J. Feldhaus is a retired partner and intellectual property lawyer with Foley & Lardner LLP. Mr. Feldhaus concentrated his practice in patent litigation involving electronic and computer technologies and was lead counsel in numerous cases on subject matter, including confocal microscopy, computer power management, plasma enhanced continuous vapor deposition, dynamic random access memories and liquid crystal display technology. He was a member of the firm's Intellectual Property Litigation Practice.

Mr. Feldhaus began his career as a patent examiner for the U.S. Patent and Trademark Office in 1974.


In 2010, the Legal 500 recognized Mr. Feldhaus for patent litigation and in 2013 - 2016, he was selected for inclusion in the Washington, D.C. Super Lawyers® lists for his work in intellectual property litigation. Mr. Feldhaus has been rated AV® Preeminent™, the highest performance rating in Martindale-Hubbell’s peer review rating system.


Mr. Feldhaus graduated from Rensselaer Polytechnic Institute (B.S., electrical engineering, 1970), where he conducted graduate studies in systems engineering from 1973 through 1974. He also graduated from George Mason University School of Law (J.D., with distinction, 1980).


He is co-author of the textbooks, "Electronics and Computer Patent Practice" and "Electronics and Computer Patent and Copyright Practice," both published by Patent Resources Institute. Mr. Feldhaus has also lectured extensively for the Patent Resources Group.

Admissions and Professional Memberships

Mr. Feldhaus is admitted to practice before the International Trade Commission, the U.S. Patent and Trademark Office, the U.S. Court of Appeals for the Federal and Ninth Circuits, the U.S. District Court for the Eastern District of Virginia and the District of Columbia. He is a member of the Virginia Bar Association.