Location: Shinagawa, Tokyo, Jpan

Who We Are

Who We Are

Masahiro Asamura

I became inaugurated as Asamura Patent Office, p.c., Director from May 2019. I entered the Asamura Patent Office, p.c. at that time in April 1999, and after being registered as a patent attorney in 2001,
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Ken Kanai

The Asamura Patent Office, p.c. responds quickly to customers’ needs for international intellectual property rights,
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Kiyoshi Asamura

With young leaders, we will strive to develop the traditional Asamura Patent Office, p.c. with the new era.
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We are top patent office in Japan

We have been experts in intellectual property since 1891. Today, we use our history, heritage and experience to help companies around the world get the results they want.

In the century we have been operating, advancements in technology have transformed the way we live, communicate and work. Over three generations we have adapted and continued to grow our expertise. Today, we are not only Japan’s longest-running patent office, we are a trusted IP partner to innovative companies from every corner of the globe.

Firm Name

Asamura Patent Office, p.c.


Tennoz Central Tower 22F (reception), 2-2-24
Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-0002, Japan


Senior Managing Partner Masahiro Asamura
Managing Partner Ken Kanai
Senior Advisor Kiyoshi Asamura


1891: Osaka Patent Agency in Kitahama, Osaka City was founded
2008: The company name is officially changed to Asamura Patent Office, p.c.
(For details, please refer to 
History of Asamura Patent Office, p.c.)

Our business is made up of:

Every member of our team is important, and we all work together to make each case a success. We make sure we appoint the right person for the job.

  • Over 103 members
  • 2 attorneys-at-law
  • 31 patent attorneys
  • Over 3,000 business-related offices abroad

Our Services

Domestic Practice
Search, domestic application, registration, maintenance after obtaining rights (annuity management), expert opinion, trial, and other procedures related to intellectual property (patent, utility model, design, trademark, etc.)

Foreign and Domestic Practice
Representing foreign clients in all IP-related matters before the Japan Patent Office (JPO)

Handling of domestic and international IP-related infringement lawsuits and countermeasures against them

IP Valuation
We offer Intellectual property valuation (AIVAS) services to measure the value and profitability of Japanese and foreign intellectual property

Brochures Please click here to download brochures and other promotional materials.

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