Masaharu OHTSUKA practiced in the intellectual property field since 1990, and joined Aoyama & Partners in 1993. Mr. Ohtsuka focuses in the area of mechanical and design patents, and particularly he is specialized in Japanese design prosecution for foreign clients, where unique feature of Japanese design system and practices, somewhat different from those in foreign countries, should be explained and expressed clearly to foreign agents who may not be familiar to the same. He have got a good many number of Japanese design patents in the name of foreign applicants.