Yoichiro Yamaguchi Photo

Yoichiro Yamaguchi



Yoichiro's practice hinges upon his extensive experience in international patent law, particularly related to Japanese intellectual property law.

His background as an expert witness, patent application examiner, and appeal examiner at the Board of Appeals in the Japanese Patent Office allows Yoichiro to offer both national and international clients unique and comprehensive counseling services regarding patents, trade secret protection, trademarks, infringement, copyright, and licensing matters. Yoichiro has examined numerous patent applications in Japan and assists many Japanese clients in protecting their valuable intellectual property assets.

Yoichiro has experience in prosecuting utility applications in utility and design applications. The technology includes computer hardware, software, semiconductors, electric circuits, batteries, fabrics, discharge lamps, ion implanting technologies, and cryo technologies. He also prosecutes trademark applications.


Yoichiro has lectured on Japanese Patent Law and Policy at the George Washington University National Law Center and was also Research Professor of the University of Tokyo, Research Center for Advanced Science and Technology. He continues to teach U.S. and Japanese comparative patent laws to Japanese Patent Office examiners at the National Center for Industrial Property Information and Training, as well as to members of the Japan Patent Attorney Association, Japan Institute for Promoting Invention and Innovation, AIPPI Japan, Japan Machinery Center for Trade and Investment, and University of Tokyo.

Yoichiro has also served as a member of the Advisory Board to Commissioner of the Japanese Patent Office. He served as an expert witness and advisor in connection with the Japanese Patent Law in several cases.

Professional Activities

  • Member, American Intellectual Property Law Association
  • Member, Licensing Executives Society
  • Member, American Bar Association




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