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With one of the largest legal teams in Japan, we bring a wealth of practical knowledge focused on the singular purpose of providing high quality legal services.

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Our lawyers have authored or co-authored a number of newsletters, articles, books and other materials covering a wide range of legal areas to address the latest legal developments and increasingly diverse and complex issues.

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Kenji Tosaki

Kenji Tosaki

Partner

Tokyo Office

Kenji Tosaki

Kenji Tosaki

Partner

Tokyo Office

Tel

+81-3-6889-7206

Fax

+81-3-6889-8206

People
Kenji Tosaki

Kenji Tosaki is a partner at Nagashima Ohno & Tsunematsu.  His practice focuses on dispute resolution.  He specializes in intellectual property litigation and complex commercial litigation, and he also covers the area of TMT including data protection matters.
In the area of intellectual property litigation, he has been handling both IP infringement litigations and IP invalidation litigations before the IP High Court, the Supreme Court, District Courts and Japan Patent Office.  His IP expertise includes a wide variety of IP matters (patents, copyrights, trademarks, design rights, unfair competition and trade secrets) in many areas, such as pharmaceuticals, telecommunications, electronics, social games, medical devices and chemicals.  He also provides pre-litigation counseling, including infringement/invalidity analysis.
In the area of complex commercial litigation, he gives advice on matters such as securities law and cross-border contract.
He is a member of the Japan Association of Industrial Property Law, the Copyright Law Association of Japan and AIPPI Japan (International Association for the Protection of Intellectual Property). He is also an active member of TechLaw Group (http://techlaw.org/), which is a global network of technology savvy law firms.

1996
The University of Tokyo (LL.B )
1998 - 2000
Judge of Tokyo District Court
2000 - 2002
Judge of Hachioji Branch of Tokyo District Court
2001 - 2002
Visiting Scholar, Southern Methodist University Dedman School of Law
2002 - 2004
Deputy Director, Planning and Legal Division, Planning and Coordination Bureau, Financial Services Agency
2004 - 2004
Judge of Tokyo District Court
2004 - 2005
Deputy Director, Office for Privitization of Japan Post, Cabinet Secretariat
2005 - 2006
Judge of Tokyo District Court (Intellectual Property Division)
2006 - 2008
Judge of Takamatsu District Court
2008 -
Nagashima Ohno & Tsunematsu
2010 - present
Member of Policy Commission, Type II Financial Instruments Firms Association
Apr 2011 -
Sep 2011
Adjunct Lecturer, Sophia Law School
2013 - present
Partner, Nagashima Ohno & Tsunematsu
2016 - 2017
Chairman, Panel of Experts of Research regarding IP Strategy of Field in Regenerative Medicine, Japan Agency for Medical Research and Development
2017 - 2018
Committee Member, Research regarding IP Strategy and Optimization of Practical Use in Biopharmaceutical, Japan Agency for Medical Research and Development
2017 - 2018
Chairman, Panel of Experts of Research regarding the handling of experimental research data in deriving achievements in the medical field, Japan Agency for Medical Research and Development
2018 - 2019
Committee Member, Research regarding IP contracts, etc., for deriving investigator - initiated clinical trial data, Japan Agency for Medical Research and Development
2020 -
Committee Member, Standing Committee on Enforcement, AIPPI (International Association for the Protection of Intellectual Property)
2021 - present
Committee Member, Center for Appointment of Judges from among Lawyers, Japan Federation of Bar Associations
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