About us

Since its establishment in 1976, we have believed in providing a wide range of comprehensive support for our clients from an intellectual property perspective.
Based on this belief, our highly specialized and autonomous professionals provide a full range of patent-related services such as searches, applications and appeals, in all technical fields, including the electrical and electronic, mechanical, software, architectural, civil engineering, chemical and life science arts, both in Japan and abroad. We also leverage our extensive experience and achievements in brand protection for many domestic and foreign clients, and further provide a wide range of trademark-related services from rights acquisition to negotiation and dispute resolution.
We aim to become one of Japan's leading IP firms widely known for the quality of our services, leveraging the relationships of trust with our clients and our extensive knowledge and experience in intellectual property that we have cultivated over our more than 45-year history.
In addition, in collaboration with Isshiki & Partners, we handle a wide range of domestic and foreign IP disputes. Our Japanese and U.S. professionals work closely together to assist our clients with a variety of issues involving intellectual property and legal matters.


Kensuke Isshiki founded Isshiki International Patent Office.
Isshiki & Co. was founded as a patent business corporation, succeeding Isshiki International Patent Office.
kazuo Isshiki became a Co-Managing Partner of the firm.
Isshiki & Co. changed the name of the firm to Isshiki Patent & Trademark Firm, and Kensuke Isshiki became a Chairman and Kazuo Isshiki became a sole President.

Firm Info

Firm Name
Kazuo Isshiki
Mita-Nitto-Daibiru Bldg. 7F,
3-11-36 Mita, Minato-ku, Tokyo 108-0073

3 minute walk from Exit A4 of Sengakuji Station (Toei Subway Asakusa Line)
- 10 minute walk from Mita Station (Toei Subway Asakusa Line / Mita Line)
- 12 minute walk from Tamachi Station (JR Line)
- 11 minute walk from Takanawa Gateway Station (JR Line)