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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New Chief Judge of the IP High Court Installed

Presiding Judge Misao Shimizu of Japan’s Intellectual Property High Court became its sixth presiding Chief Judge in January 2017. The Hon. Shimizu’s Inaugural Remarks are available on the IP High Court’s website.[1] Japan instituted the IP High Court, connected to…
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Appeal to Final Decision, IP High Court, IP News, Litigation, Patent Infringement, What's New

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Post Issuance Proceedings in Japan (Presentation)

The options and implications for post-issuance/grant proceedings and oppositions in Japan can be complicated, and you will need to take various factors into consideration. Our presentation gives you background and ideas for protecting or challenging issued patents. We would be…
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Government Policy, IP High Court, Litigation, Patent Infringement

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JPO Working Together with KIPO and SIPO to Improve IP Protection

Heads of the Japan Patent Office have recently completed an IP symposium with corresponding leaders in the Korean Intellectual Property Office (KIPO) and the State Intellectual Property Office of the People’s Republic of China (SIPO) in Kanagawa Prefecture. They have…
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IP News, What's New

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