Partners  >  Andrew Kumamoto

Andrew Kumamoto

Andrew Kumamoto is Chair of the Firm.  He is a full service IP attorney with experience in patent prosecution, adversarial proceedings in the Patent Office, patent trials and litigation, IP transactions, and IP counseling. His experience spans a wide array of technology areas, including pharmaceuticals, antibodies and other biologics, platform technologies, research tools, medical devices, biotechnology, and semiconductors. He has advised start-up, mid-cap, and fortune 500 companies on IP issues which arise at these different stages. Prior to co-founding HelixIP, Andrew was a partner in the Silicon Valley Office of McDermott, Will & Emery LLP. He also worked as an IP attorney at Cooley LLP, Bingham McCutcheon LLP, and Pennie and Edmonds LLP. Andrew has in-house experience having served as the outside General Counsel for Target Quest, LLC (phage display with human antibodies), Director of Intellectual Property for Hyseq, Inc. (Genomics and SBH platform), and patent attorney for Cell Genesys, Inc. (transgenic mice for making human antibodies).



(650) 517-3101


J.D., University Southern California, 1995
Ph.D., Molecular Biology (NIH Fellowship in Genetics), University of California, Los Angeles, 1989
B.S., Biochemistry, University of California, Los Angeles, magna cum laude, departmental honors, 1981


California State Bar
U.S. Patent and Trademark Office
Federal Circuit Court of Appeals
Ninth Circuit Court of Appeals
U.S. District Courts for the Northern, Central, and Southern Districts of California

Industry Experience
    • Cell Genesys, Inc. – Patent Attorney
    • Xenotech, Inc. – Patent Attorney
    • Hyseq, Inc. – Director of Intellectual Property
    • TargetQuest LLC – Outside General Counsel

Representative Patent Office Proceedings
    • Inter Partes Reexamination Proceedings 95/001,076
    • Patent Inferference No. 105,830
    • Ex Partes Reexamination Proceedings 90/010,734

Representative Litigations (represented party in bold)


    • Amgen, Inc. v. Hoffman-LaRoche (D. Mass. 2007)
    • Genentech, Inc. and Tercica, Inc. v. Insmed, Inc., et al. (N.D. Cal. 2006)
    • Genzyme Corp. v. Seikagaku Corp., et al. (D. Mass 2012)

Other Litigations:

    • Genentech, Inc. v. Amgen, Inc. (N.D. Cal. 2000; Fed. Cir. 2002)
    • Elan Pharmaceuticals, Inc. v. Mayo Foundation (N.D. Cal.)
    • Depomed v. Lupin Inc. (N.D. Cal.)