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.

About us


Kusumoto Patents & Trademarks is a patent law office in Japan dealing with Japanese patents, designs and trademarks, established in 1987 by Mr. Takayoshi Kusumoto, the former vice president of Japan Patent Attorneys Association.
After the merger with Konan Patent law office led by Mr. Fujikawa in 2017, our two offices stand close by Lake Biwa in Shiga Prefecture, the largest lake in Japan located almost at the center of the country.
We value our principle “put heart into every word” and business motto “We are With You”, and are also proud to have been supporting clients of national and global, with professional experience of more than 30 years.

Our Founders

Takayoshi Kusumoto:

【Ishiyama Office】
・Former vice president (2015) of Japan Patent Attorneys Association
・Former director (2011, 2012) at Kinki* Branch of Japan Patent Attorneys Association (KJPAA)
・Visiting professor at The University of Shiga Prefecture
* Kinki: southern-central region of Japan’s mainland

Tsuneo Fujikawa:

【Seta Office】
・Co-founder of Kusumoto Patents & Trademarks
・Part-time lecturer of Ryukoku University since 2006
・Advisor at Shiga Institute of Invention and Innovation
・Counselor at Shiga Prefecture Industrial Support Center
・Expert at Shiga Prefecture Chamber of Commerce and Industry

Technological fields

We obtain and maintain intellectual property rights in various technological fields. We have extensive knowledge and know-hows in section F (for MECHANICAL ENGINEERING) and section H (for ELECTRICITY) by IPC classification, while also covering electronics, chemistry, IT, and biotechnology as professional and technological fields of expertise.

Direct Support in English

We communicate with our foreign clients through close communication, having in-house translation staffs to link clients and attorneys together. We could also offer various services as follows if necessary;

  • Network Support: Connecting clients, especially for companies and business persons who are unaccustomed to Japanese application procedures, with translation companies.
  • Deadline Management: Sending clients friendly reminders on important due dates for maintaining intellectual property rights valid.

Applications in the Past

  • Patents> USA, EPO, China, South Korea and more
  • Trademarks> USA, EU, China, South Korea and more

Our Services Menu

1. Patent and Utility Model
  • Mechanical, Civil Engineering & Construction
  • Electrical & Information Technology
  • Chemical & Biotechnology
2. Trademark & Design
3. Patent & Trademark Search
4. Translation
5. Domestic Filing
6. Overseas Filing
7. On-line Application Filing & Drawing Preparation

Our Network

Our world network of foreign affiliations includes law 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.

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