Kusumoto Patents & Trademarks is a patent law office in Japan dealing with Japanese patents, designs and trademarks, which was founded more than 30 years ago. It is located near Lake Biwa, which is situated almost in the center of Japan. We maintain the principle of "write words with all our heart" and we accomodate our client's requests in a manner "We are With You".

About us

KUSUMOTO PATENTS & TRADEMARKS (Japanese Patent Law Office)

KUSUMOTO PATENTS & TRADEMARKS specializing in intellectual property matters was established in September 2017 by a merger of Kusumoto Patent Office and Konan Patent Office.

Having two offices (in Ishiyama and in Seta) by the merger enables us to provide more client-focused services by utilizing our thirty years of extensive experience for acquiring and protecting patent, trademark and design rights for clients in a variety of industries.

Our world network of foreign patent law organizations includes firms in the United States of America, Canada, United Kingdom, Germany, France, Italy, Russia, Australia, Brazil, Mexico, China, Hong Kong, Taiwan, South Korea, Thailand, India, Indonesia, Singapore, Malaysia, Vietnam, etc.

The patent applications we file at the request of clients abroad are increasing steadily in number.


  • Patent Application
  • Utility Model Registration Application
  • Design Registration Application
  • Trademark Registration Application
  • Translation of Technical and Legal Documents


1.Patent and Utility Model Department

    • Mechanical, Civil Engineering & Construction Group
    • Electrical & Information Technology Group
    • Chemical & Biotechnology Group

2.Trademark & Design Department
3.Patent & Trademark Search Department
4.Domestic Filing Department
5.Overseas Filing Department
6.On-line Application & Drawing Preparation Department

KUSUMOTO PATENTS & TRADEMARKS has five patent attorneys available.

We have clients in various industries including major corporations, such as Nitto Denko Corporation, Daikin Industries, Ltd., Kyocera Corporation, Nissin Food Products Co., Ltd., Kaneka Corporation, Gunze Limited, and Shiga Prefectural Government.