Life Sciences and Pharma IP Litigation 2025

JAPAN Trends and Developments

Trends and Developments Contributed by: Kenji Tosaki and Takahiro Hatori Nagashima Ohno & Tsunematsu Nagashima Ohno & Tsunematsu is widely rec - ognised as a leading law firm and one of the foremost providers of international and com - mercial legal services. Based in Tokyo, Japan, the firm’s overseas network includes locations in New York, Singapore, Bangkok, Ho Chi Minh City, Hanoi, Jakarta (associate office) and Shanghai. Nagashima Ohno & Tsunematsu also maintains collaborative relationships with prom - inent local law firms. In representing its leading domestic and international clients, it has suc - cessfully structured and negotiated many of

the largest and most significant corporate, fi - nance and real estate transactions related to Japan. In addition to its capabilities spanning key commercial areas, the firm is known for path-breaking domestic and cross-border risk management/corporate governance cases and large-scale corporate reorganisations. The over 500 lawyers of the firm work together in cus - tomised teams to provide clients with the ex - pertise and experience specifically required for each matter.

Authors

Kenji Tosaki is a partner at Nagashima Ohno & Tsunematsu. He specialises in intellectual property (IP) litigation. He handles both IP infringement litigation and IP invalidation

Takahiro Hatori is an associate at Nagashima Ohno & Tsunematsu. His practice focuses on intellectual property (IP) and dispute resolution. He has experienced a variety of IP

litigation before the IP High Court, the Supreme Court, District Courts and the Japan Patent Office. His IP expertise includes a wide variety of IP matters in many areas, such as telecommunications, electronics, social games and pharmaceuticals. He also provides pre- litigation counselling, including infringement/ invalidity analysis.

matters, especially dispute resolutions, and provided legal advice in relation to patent infringement, patent invalidation, trade marks, the Unfair Competition Prevention Act, copyright, and IP-related agreements.

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