Keisen: Putting You First in Japan (and Beyond)

Welcome to Keisen Associates! Keisen means "fountain of blessings" in Japanese. Our mission is 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--and beyond.

IP News


Q&A: Fixing Errors and Making Changes in a PCT Application’s Japan National Phase

As we say in Japan, “Even monkeys fall from trees.” Even expert inventors, applicants, writers, and agents can make errors in their patent documents. Clients have approached us concerning various errors made in their PCT international patent applications, wondering what…
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Amendments, Filing Translation, Government Policy, Japanese national phase entry, Language Translation

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