Shinjuku L Tower 22nd Floor, 1-6-1
Nishi-Shinjuku Shinjuku-Ku,
Tokyo, 163-1522


Distinguished Practitioner



Practice area:

Intellectual property

Principal practice areas/industry focus: Prosecution, Licensing, Litigation, Opinions, Customs surveillance in the fields of Japanese Patent, Design, and Trademark law

Career highlights: In 1987, Mr. Ryuka began his career as an electrical engineer in the facsimile machines department of Canon Inc. Five years later, he joined Tani & Abe Patent Attorneys in Tokyo, Japan, where he prosecuted patent applications of foreign and domestic applicants including Canon Inc.

From 1995 to 1998, Mr. Ryuka worked in the Washington, DC office of US firm Cushman Darby & Cushman, where he mainly prosecuted patent applications for Japanese clients. At the same time, he established a patent firm in Japan and a translation company in the US, the predecessors to RYUKA IP Law Firm. While in the US he passed the US patent bar exam.

Since founding RYUKA IP Law Firm, he has lectured extensively in Japan and abroad on IP topics, has published numerous articles including recently detailing RYUKA’s invention consulting services (Patent Visualization), and visits clients and attends conferences in the US, Europe, and Asia. Recent work in 2012 includes representing a large US client in nullity trials before the Japan IP High Court and Supreme Court, in cooperation with Nagashima Ohno & Tsunematsu, and representing a large Korean client in infringement and nullity trials in cooperation with Anderson Mori & Tomotsune.

Asialaw Distinguished Practitioner 2021 in Intellectual property