Welcome to Keisen Associates!

"Kéisén" means an "inexhaustible spring" in Japanese as we hope to become a wellspring of legal solutions for all matters relating to Japanese intellectual property law. Kéisén Associates, formerly Omori & Yaguchi, is a Tokyo-based Japanese intellectual property law firm with offices in Tokyo and Philadelphia, Pa. Our practice offers a broad range of Japanese and international legal support in patent, design, and trademark law. We offer prior art search, in-house technical translations, international licensing, as well as legal consultation for international business development and technology transfer support in Japan. Our highly skilled attorneys and patent agents are supported by a team of technical advisers, translators and administrative staff who are fluent in English. We can provide clients with a seamless, efficient, and cost effective service in all areas intellectual property protection in Japan.

Japan’s IP News

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JPO’s Brand New Commissioner!

On June 16th, 2016, the successor of the Japanese Patent Office (JPO) Commissioner Ito has been announced to be Commissioner Yoshinori Komiya. As a result, Commissioner Ito is retiring from a successful career serving in Japanese government services. Commissioner Ito…
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