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

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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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