Current Practice Areas

Mr. Yudai Mizunaga’s practice focuses on the Preparation and Prosecution of Domestic and International Applications, Invention Mining, and IP Consulting to provide legal and technical expertise to clients.

Technical Fields
Mr. Mizunaga’s experience covers a wide range of technical fields including Chemistry, Biotechnology, Semiconductors and Electronic Devices, and Machinery.

In detail, Mr. Mizunaga has deep understanding in the fields of Inorganic Chemistry, Organic Chemistry, Materials, Cosmetics, Foods, Medicine, and Electronic Devices.

Mr. Mizunaga provides concrete and realistic advice to clients by examining IP-related matters from the client’s stance and closely cooperating with the client.
His experiences in developing applications allow him to provide suggestions from various angles in each step of product planning, product development, marketing, and sales.
Mr. Mizunaga combines his expertise in IP matters with his comprehensive business experiences to provide client services with high added value.


Mr. Mizunaga’s careers prior to joining Prezio include:
a member of an international IP firm (Prezio) and
a founder of an application development company.

Educational Background

Educational Background
Mr. Mizunaga earned his Bachelor of Science in Bioengineering from the Department of Life Science and Technology, Tokyo Institute of Technology and his Master of Science in Bioengineering from the Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology.

In particular, Mr. Mizunaga was engaged in the search for novel antibiotics that approach control mechanisms of bacterial RNA metabolism at university and the elucidation of the cell division mechanism (the physical mechanism governed by specific proteins), which is the early development of animal cells in the graduate master's program.

Mr. Mizunaga’s Master’s Thesis is entitled

The thesis investigates the mechanism of cellular division in sea urchin eggs.


M.S. in Bioengineering
PADI Advanced Open Water Scuba Diver


● Coauthor. “New Patent Practice Manual of Numerical Limitation Inventions and Parameter Inventions – Best Use of Development Results and Measures against Competitors’ Patents”, Tokyo: JOHOKIKO Co., Ltd., August 2018 (in Japanese)
● Coauthor. “How to Deal with Reasons for Rejection in Chemical and Material Patents”, Tokyo: Science & Technology Co., Ltd., February 2017 (in Japanese)
● Coauthor. “Winnable Patent Practices in Chemical and Material Patents”, Tokyo: Science & Technology Co., Ltd., March 2011 (in Japanese).