Life Sciences and Pharma IP 2026

JAPAN Trends and Developments

Trends and Developments Contributed by: Kenji Tosaki and Takahiro Hatori Nagashima Ohno & Tsunematsu

Nagashima Ohno & Tsunematsu is based in Tokyo and widely recognised as a leading law firm and one of the foremost providers of international and com ‑ mercial legal services. The firm’s overseas network includes locations in New York, Shanghai, Singapore, Bangkok, Ho Chi Minh City, Hanoi and London, and it also has an associate office in Jakarta. It also main ‑ tains collaborative relationships with prominent local law firms. In representing leading domestic and inter ‑ national clients, Nagashima Ohno & Tsunematsu has successfully structured and negotiated many of the

largest and most significant corporate, finance and real estate transactions related to Japan. In addition to capabilities spanning key commercial areas, the firm is known for path-breaking domestic and cross- border risk management/corporate governance cas ‑ es and large-scale corporate reorganisations. The over 600 lawyers of the firm work together in cus ‑ tomised teams to provide clients with the expertise and experience specifically required for each client matter.

Authors

Kenji Tosaki is a partner at Nagashima Ohno & Tsunematsu. He specialises in intellectual property litigation, handling both IP infringement litigation and IP invalidation litigation before the IP

Takahiro Hatori is a partner at Nagashima Ohno & Tsunematsu. His practice focuses on intellectual

property disputes involving patents, trade secrets, trademarks and other IP rights. Takahiro also provides advice on a wide range of IP matters, including licensing and other IP-related agreements, management and protection of trade secrets and data, and employee inventions.

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. Kenji also provides pre-litigation counselling, including infringement/invalidity analysis.

Nagashima Ohno & Tsunematsu JP Tower 2-7-2 Marunouchi Chiyoda-ku Tokyo 100-7036 Japan

Tel: +81-3-6889-7000 Fax: +81-3-6889-8000 Email: kenji.tosaki@nagashima.com Web: www.nagashima.com/en

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