- Mutsuki Partners is an intellectual property law firm carried out by two partners of Patent Attorneys, Benri-shi.
- We started as several individual firms, and then worked together to make an ideal IP law firm. Our firm was incorporated under the current name, MUTSUKI PARTNERS IP Firm in January 2010. "Mutsuki" in Japanese has a meaning of the started month in a year.
- Our Tokyo office has moved from Meguro to East-Ginza of Tokyo center area on April 1, 2015. We have two branch offices in Niigata and Yokohama for various IP services.


We welcome new patent attorney.

We renewed our home page.
We have been tied up with Izumi International Patent Firm of Yokohama.

Masato Nagasaka has been transferred to Tokyo Customs as a specialist for intellectual property rights.


The Japan Patent Office (JPO; Tokkyocho) is a Japanese governmental agency in charge of industrial property right affairs.....

The Japan Patent Attorneys Association (JPAA) is the only organization of registered patent attorneys, Benri-shi......

The National Center for Industrial Property Information and Training (INPIT) is an Independent Administrative Institution in Japan for providing comprehensive information on industrial property.....

The Intellectual Property High Court is a court specializing in intellectual property cases for hearing appeals from district courts in Japan on patent actions and suits against appeal/trial decisions made by the JPO....