About Isshiki & Co.


Kensuke Isshiki founded the firm in 1976. Succeeding Isshiki International Patent Office, Isshiki & Co. was established in 2003 as a patent business corporation. Isshiki & Co. is located in central Tokyo and currently employs about 70 individuals, including about 24 patent attorneys.

Practice Areas

We handle all types of intellectual property matters, from prosecuting Japanese and international patent, utility model, trademark and design applications to rendering expert opinions as well as representing clients before the Japanese courts and the Japan Patent Office. We also handle copyright, unfair competition and other intellectual property matters.

With regard to patents and utility models, our team of patent attorneys and staff cover a full range of technology areas from electrical, electronic, mechanical, chemical, architectural, civil and software engineering to pharmaceutical and biotechnology. With regard to trademarks and designs, we prosecute, search and counsel in all classifications.

More than half of our patent attorneys are qualified as infringement lawsuit counsel and have extensive experience in opinion work, infringement litigation, invalidation proceedings, etc.

International Matters

Our attorneys and staff include many who are proficient in English, and we help support a wide range of international matters for our clients.

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Isshiki International Law Office

Our firm works closely with Isshiki International Law Office, the Tokyo-based U.S. law firm specializing in intellectual property and dispute resolution matters. Mr. Taro Isshiki, who founded Isshiki International Law Office in 2011, is a registered foreign lawyer and counsel to Isshiki & Co.

see web site of Isshiki International Law Office



Mita-nitto Daibiru Bldg. 7th Floor,
11-36, Mita-3-Chome, Minato-ku, Tokyo,
108-0073, Japan
TEL: +81-3-4500-9106 / FAX: +81-3-3455-4377


[ Toei Subway Asakusa Line ] 5 minute walk from Sengakuji Station
[ Toei Subway Asakusa Line / Mita Line ] 10 minute walk from Mita Station
[ JR Line ] 11 minute walk from Takanawa Gateway Station
12 minute walk from Tamachi Station