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Tsuyoshi Sueyoshi

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National Leader

Japan - Life Sciences

Professional Biography

WWL Ranking: Recommended

WWL says

Tsuyoshi Sueyoshi commands respect for the depth of his expertise in patent litigation and licensing matters.


Tsuyoshi Sueyoshi is a partner of Yuasa and Hara in Tokyo. Dr Sueyoshi is well grounded in science and technology and has experience in R&D of private businesses. His practice covers intellectual property and business transactions, especially patent litigation and licensing, as well as invalidation proceedings both in low molecular compounds and biologics, technology-related disputes and negotiations, and pharmaceutical regulations for OTC/prescription drugs.

Dr Sueyoshi represents domestic and international clients in Japanese courts for infringement cases; the Japan Patent Office (JPO) for invalidation trials; and the Japanese IP High Court for appeal cases regarding JPO decisions. His representations include the recent enlarged panel (“Grand Panel”) case of the IP High Court concerning inventive steps of a new active ingredient of hyperlipemia drug Crestor as well as Grand Panel case concerning a patent term extension of the anti-cancer drug Avastin and the subsequent Supreme Court case .

Dr Sueyoshi has handled cases in various industries including pharmaceuticals; biotechnology; research instruments in life sciences; microbial process, consumer products such as toiletry products; performance chemicals; chemical engineering; production process of chemicals; semiconductors;, liquid crystals, telecommunications and software.

Dr Sueyoshi majored in chemistry at the Faculty of Science, University of Tokyo (BSc), and obtained his PhD studying physical chemistry, surface science and electron spectroscopy at the Graduate School of Science, University of Tokyo. He joined one of the largest chemical companies in Japan and worked in its R&D centrere for five years. Following his experience in patent prosecution practice under qualification for the JPO, he qualified as a Japanese lawyer.

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