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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Proper Formatting for Translations and Content Submitted to the JPO

Q. I have ready a Japanese translation for my application; can I have Keisen submit the translation as it is? A. In short, No. Generally speaking, a translation provided by an applicant cannot be filed as it is in Japan…
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Filing Translation, Government Policy, How much does it cost?, Language Translation

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JPO Expands Patent Prosecution Highway (PPH) Connections with South America

The Japan Patent Office (JPO) continues to expand its Patent Prosecution Highway (PPH) network with pilot programs initiated with the National Institutes of Industrial Property (INPI) of Brazil and Argentina, respectively, from April 1, 2017. The JPO plans to start…
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Accelerated examination, Government Policy, IP News, Request for Examination, What's New

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Strategy for Requesting Late Filing (Reinstatement) of a Patent Application in Japan

When a patent application one wanted to file in Japan is filed late, how can the applicant win approval for late filing (Reinstatement)? They may file a Request for Reinstatement. In Due Care and Late Filing (Reinstatement) of an Application…
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Filing Deadlines, Government Policy, Japanese national phase entry, Missing the 30-Month Deadline, What's New

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Due Care and Late Filing (Reinstatement) of an Application in Japan

Is it possible to reinstate a lapsed application in Japan? This is a question we are asked frequently at Keisen. The short answer is, Yes! It certainly is possible. The longer answer is that, although it is possible, the standards…
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Filing Deadlines, Government Policy, Japanese national phase entry, Missing the 30-Month Deadline, What's New

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Disclosure Grace Periods: Does the JPO Allow Patents for Prior Disclosures by the Inventor?

What If I Disclose My Invention Before Applying for Patent Rights? Patent applications have to be filed before a prior art disclosure in Japan. But what if the disclosure is the inventor’s own? Can he lose novelty against his own…
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Filing Deadlines, Grace Period, Japanese national phase entry

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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‚Äôs Republic of China (SIPO) in Kanagawa Prefecture. They have…
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IP News, What's New

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