Firm Profile


HAGIRI AND ASSOCIATES, since established in 1988, offers high-quality services related to intellectual properties and, together with our patent attorneys and staffs, has continuously grown to meet the needs of our clients.

Due to the increasing importance in intellectual property rights in recent years, intensifying market competition accelerates complication and sophistication of the intellectual property right matters. Accordingly, more flexible and comprehensive approaches are required for dealing with each of such IP-related matters.

Under such circumstances, we carefully look into each patent matter not only from a perspective of Patent Act but also from various perspectives of Utility Model Act, Design Act, and Trademark Act to offer the optimal approach for our clients in order to thoroughly and strongly protect your valuable intellectual property rights.


We, in association with affiliated lawyers, also handle various cases including infringement litigation procedures, dispute resolution procedures, etc.

We look forward to having the opportunity to provide you with the best possible service.

Masaharu Hagiri



Office Information

Name Hagiri and Associates
Location 4F, 21-Towa Bldg.,
6-1, Iidabashi 4-chome,
Chiyoda-ku, Tokyo 102-0072, Japan
Access Iidabashi Station
. JR Chuo/Sobu Line (3 minutes from East exit)
. Tokyo Metro/Toei Line (3 minutes from exit A4)
. Tokyo Metro (Tozai Line, 1 minute from exit A5)
Business Services:
All procedures for obtaining IP rights: Patents, Designs, Trademarks, and Utility Models
Expert Opinions, Trials, Searches, Opinions & Counseling, Litigations
Legalization, Notarization
Industrial Fields:
Electricity, Machinery, Semiconductor device, IT, Cosmetics, Food products, etc. 
History Established in 1988
1988: Open office in Toranomon
1991: Move to Itabashi for business expansion
2002: Move to Iidabashi (current address) for business expansion
Employees 5 patent attorneys and other staff members
Comments We, as a patent firm with patent attorneys having a wealth of expertise and experience in a variety of fields, provide diverse services to both our domestic and overseas clients, handling patent matters, utility models, as well as design and trademark matters. We also provide consultation and support for small and medium-sized enterprises.


© 2023 Hagiri and Associates