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Sugimura and Partners

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No. of attorneys  61
Major practice areas  Intellectual Property
Founder  Kenji Sugimura
Number of attorneys  61
No. of employees  about 160
Date founded  1923
Founded  1923
Number of offices  2 (Tokyo and Palo Alto)
No. of offices  2 (Tokyo and Palo Alto)

Sugimura & Partners (杉村萬国特許法律事務所, Sugimura Bankoku Tokkyo Houritsu Jimusho) formerly known as Sugimura International Patent and Trademark Attorneys is an intellectual property law firm based in Japan. The firm has an international presence, representing clients from around the world. The firm represents more than 200 clients ranging from single inventors and start-ups to academic institutions and international corporations. Approximately half of Sugimura's client base consists of Japanese businesses and organisations, while the other half is foreign counterparts. It has a global legal network in over 40 countries.



Sugimura was founded in 1923 by patent attorney and engineer Nobuchika Sugimura. The firm specializes in providing quality legal services in the acquisition, protection and consultation of Japanese IP rights, and is repeatedly ranked among the top Japanese patent and trademark firms. The company has offices in Japan and the United States, as well as professional relationships with associate law firms located in more than 80 countries. In 2017, the firm changed its name from Sugimura International Patent and Trademark Attorneys to Sugimura & Partners. Today, Kenji Sugimura. Principal Patent Attorney, and Koji Sugimura, Principal Attorney at Law are leading the firm.


It is headquartered in the Kasumigaseki Common Gate West Tower in Kasumigaseki, Chiyoda, Tokyo, Japan, and has a representative office in Palo Alto, California, U.S.A.


Sugimura is repeatedly ranked among top Japanese patent and trademark law firms.

The firm is consistently ranked on the World IP Survey. The firm has been ranked in the patent prosecution and trademark prosecution categories.

World Trademark Review recognizes the firm as a leading trademark professional in Japan.

Intellectual Asset Management recognizes the firm as a leading patent professional in Japan.

Asian Legal Business recognizes the firm as a leading domestic patent firm.

The firm is also featured in Legal 100 of Acquisition International magazine.

Notable representations

  • Hidetsugu Yagi, Inventor of Yagi-Uda antenna
  • Irène Joliot-Curie, Atomic Energy Generation Device Case
  • Valentino Garavani, Rudolph Valentino Case
  • Publications

    Patent attorneys from Sugimura have featured in or written various articles about IP industries, and have been invited as speakers at various instituesa and IP meetings.

  • Kenji Sugimura, "Japan's New Patent Rules". Managing Intellectual Property. February 2010. 
  • Kenji Sugimura, Takahiro Yamazaki, "Effective Ways to Obtain Japanese Patents". World Intellectual Property Review. September 2011. 
  • Kenji Sugimura, Rebecca Chen, "An Important Market: Software Patenting in Japan". World Intellectual Property Review. September 2012. 
  • Rebecca Chen, "Intellectual Property: the Importance of Protecting Intangible Assets". Acquisition International: 55. February 2013. 
  • Kenji Sugimura, Rebecca Chen, "iPS Cell Technology Spurs Biological Patenting in Japan". World Intellectual Property Review: 66–68. 2013. 
  • Tetsuo Tsukanaka, Inventive Step of Invention (PDF). JPO, JIII. 2011. 
  • Tetsuo Tsukanaka, Patents for Pharmaceuticals (PDF). JPO, JIII. 2011. 
  • References

    Sugimura & Partners Wikipedia

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