Welcome to Keisen Associates ! (old)

“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, New York  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 advisors, 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.

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