About Office


First of all, I would like to thank everyone who has supported us since our firm was established in July 2011.

During this time, we have been blessed with the opportunity to meet many clients and we have engaged in extensive activities, including but not limited to patent assessments, license negotiations and intellectual property management consultations.
To meet our clients' diverse needs, we established Dorait IP Law Firm in July 2017 whereupon we changed our registration as a private office to a patent attorney corporation.

Based on our motto of "For the Creation and Utilization of your Intellectual Property," we will continue to strive for results that will exceed your expectations. We appreciate your continued support.

Dorait IP Law Firm (a patent attorney corporation)

Tadanori YOSHIDA, President / Patent Attorney

Yasuko YOSHIDA, Partner / Patent Attorney

Drait office

Company overview

Company Dorait IP Law Firm (a patent attorney corporation)
Address #411 La Tour Shinjuku, 15-1, Nishi-shinjuku 6-chome, Shinjuku-ku, Tokyo 160-0023, Japan
Established July 2011
Phone/Fax +81-3-5909-1072/+81-3-5909-1073 e-mail all@dorait.jp
Representative Tadanori YOSHIDA Number of employees 18 (of who, 9 are patent attorneys) [As of January 2022]
Our business Filing patents, utility models, design and trademarks, various appeal trials, filing patents overseas (Paris route, PCT route), licensing, appraisals, lawsuits and other intellectual property services
Closed on Saturdays, Sundays and national holidays


President Tadanori YOSHIDA's nickname is DORAEMON, the world famous cartoon cat. His first name "Tadanori" means "do the right thing" when written in kanji. "DORAIT" is mixture of his nickname and 'the right.' Our aim is to support clients' acquisitions and utilization of just (robust) IP rights

Dorait IP Law firm office


Dorait IP Law firm is located in Central Park Tower La Tour Shinjuku, a building near to the Metropolitan Government building of Tokyo, Hyatt Regency Tokyo and Hilton Tokyo. The building has a supermarket, Maruetsu Petit, on the ground floor.

When you visit us, please ask the reception desk in the lobby of the building to ring "#411 Dorait IP Law Firm."
If you arrive early, you can wait in the building's café.

  • #411 La Tour Shinjuku, 15-1, Nishi-shinjuku 6-chome, Shinjuku-ku, Tokyo 160-0023, Japan
  • +81-3-5909-1072
  • Tokyo Metro:
    Marunouchi Line | 2 minutes from Nishishinjuku Station Exit C-8 (to Hilton)
  • Toei Subway:
    Oedo Line | 5 minutes from Tochomae Station Exit A4
  • JR Line:
    14 minutes from JR Shinjuku Station West Exit

Contact us

If you have any inquiries about filing patents, patent trials, lawsuits, appraisals and studies, please contact us by phone, FAX, or email using the form below.

  • +81-3-5909-1072
  • +81-3-5909-1073 FAX