Yasunori Ohtsuka

Yasunori Ohtsuka

Patent Attorney, Partner

Japanese Patent Attorney since 1972


Patent prosecution, appeal proceedings, oppositions, invalidation actions and litigation in the technical fields of business equipment, telecommunications, and medical devices

Counseling in licensing negotiations, particularly in relation to standard essential patents

Litigation support for cross-border cases

Counseling clients on patent, design, trademark, and competition law


B.A., Chuo University, Diploma in Law

Tokyo Electric University, School of Electronics


Patent Attorney at former Burroughs Japan (Unisys)

Worked as an in-house patent attorney for Burroughs Japan prior to founding the Ohtsuka Patent Office.

Brought the Office into the top twenty patent law firms in Japan and into the top ten patent law firms in the fields of electronics and physics.

Memberships, Positions and Academic Activities

Japan Patent Attorneys Association

Chairman, Japan-U.S. Study Group, Patent Attorneys Association (1996)

Permanent Member, Patent Attorneys Association (1997)

International Association for the Protection of Intellectual Property (AIPPI)

Licensing Executives Society Japan (LES)

Japan Trademark Association

The Institute of Image Electronics Engineers of Japan

Institute of Electronics, Information and Communication Engineers

The Imaging Society of Japan


Protecting Intellectual Property in Japan (AIPPI)

Trial/Appeal Procedure in the U.S. and in European Countries (Gyosei)

Patent Law and its Practice (co-author; published by Ohm)

The Fundamentals of Patents (co-author; published by Ohm)

Case Studies from CAFC Decisions (I) (II) (published by ILS)

Frequently Asked Questions about Patents (co-author; published by Ohm)