Welcome to Keisen Associates!

Keisen means "spring of blessings" in Japanese. We, Keisen Associates, aim to be a wellspring of legal services for all matters of Japanese intellectual property law.
Keisen Associates (formerly Omori & Yaguchi) is a Tokyo-based Japanese intellectual property law firm with an office in Philadelphia, Pennsylvania. We offer a broad range of Japanese and international legal support in patent, design, and trademark law. Our services include including prior art searches, in-house technical translations, international licensing, and legal consultation for business development and technology transfer 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 are delighted to provide our clients with seamless, efficient, and cost-effective service that flows into all areas of intellectual property protection in Japan.

Japan’s IP News


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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