Marc K. Weinstein is a member of the Post-Grant Patent practice group focusing on post-grant proceedings, litigation and IP counseling. Mr. Weinstein has a broad-based and comprehensive experience in patent law including prosecution and opinions, as well as licensing, litigation, and post-grant work.

Mr. Weinstein has handled all aspects of post-issuance patent proceedings at the United States Patent and Trademark Office (USPTO) including ex parte reexamination, inter partes reexamination, and inter partes review proceedings. He has represented a variety of clients, including those in the technological areas of GPS and navigation, glass composition, cellular communication, imaging and displays, and computer software.

In prior positions, Mr. Weinstein has worked on numerous patent disputes both at the U.S. District Court and before the International Trade Commission. He has experience in every aspect of litigation including preliminary investigations, drafting complaints, overseeing discovery, drafting motions and briefs, conducting and defending depositions, preparing witnesses, and arguing motions.

Mr. Weinstein has extensive experience working with Japanese clients including living and working in Tokyo for over 10 years. In his time in Japan, he worked closely with Japanese clients on a variety of matters including strategic prosecution, opinions, licensing, patent litigation and post-grant proceedings. His work on patent litigation included handling all aspects of discovery, preparing witnesses and defending depositions, and drafting motions and briefs.

Throughout his career, Mr. Weinstein’s practice has worked on matters involving a myriad of technologies with a particular focus all aspects of cellular communication technology, GPS and navigation, imaging and display technology, computer hardware and software, financial products, semiconductors, and liquid crystals, and many other related technologies.

Mr. Weinstein is also a former patent examiner at the USPTO, where he examined patent applications related to I/O processing and multi-computer architectures.


  • Georgetown University Law Center (J.D.)
  • Pennsylvania State University (B.S.)
    • Electrical Engineering


  • Virginia
  • District of Columbia
  • Registered to practice before the U.S. Patent and Trademark Office
  • Supreme Court of Virginia

Professional Affiliations

  • Tokyo Intellectual Property Inn of Court


  • Disputes Star, Benchmark Asia-Pacific (2013, 2014)


  • Japanese