The following table shows the ranking of Japanese IP law firm. The ranking is based on the following conditions.

  • Technical field:  Biotechnology (Protein, amino acid, DNA, RNA, Recombinant DNA, antibody, peputide, iPS cell, ES cell, vaccine, etc.)
  • Status:  Japanese granted patents in 2018 (registration date).
  • First country:  All (i.e., patents with claiming priority of a Japanese application or a foreign application, or without claiming priority).
  • Count:  The number of patents handled by each Japanese IP law firm was counted (if the applicant is represented by a firm member (attorney), it was counted as being handled by the firm).
RankingNo.IP law firmWebsite
1505SHUSAKU・YAMAMOTO View
2333SHIGA International Patent Office View
3326Hiraki & Associates View
4323Shimizu Patent Office View
5312Aoyama & Partners View
6266Abe, Ikubo & Katayama View
7247SEIWA PATENT & LAW View
8210Nakamura & Partners View
9208YUASA AND HARA View
10143Soei Patent & Law Firm View
11133SAEGUSA & Partners View
12128Kuzuwa & Partners View
13123KAWAGUTI & PARTNERS View
14106Takaoka IP Law View
15104SUBARU PATENT OFFICE View
16101Sonoda & Kobayashi View
1798KYOWA PATENT AND LAW OFFICE View
1898Takashima International Patent Office View
1993TSUKUNI & ASSOCIATES View
2090The Patent Corporate Body Aruga Patent Office View
2183TMI Associates View
2274SIKs & Co. View
2374Anderson Mori & Tomotsune View
2471Hirota & Associates View
2567ONDA TECHNO Intl. Patent Attys View
2665IP Firm SHUWA View
2764Asamura Patent Office, p.c. View
2862OHNO & PARTNERS View
2959ITOH International Patent Office View
3055Orion Patent Office View
3155Okuyama & Sasajima View
3254SUZUYE & SUZUYE Intellectual Property Law View
3354Shobayashi International Patent &Trademark Office View
3450SUGIMURA & Partners View
3550HARAKENZO WORLD PATENT & TRADEMARK View
3649Hirota, Nagare & Associates View
3749TAIYO, NAKAJIMA & KATO View
3845Sonderhoff & Einsel View
3944Kita-Aoyama International Patent Bureau View
4042SK Intellectual Property Law Firm View
In preparing the table, a patent search expert conducted a patent search using patent classification and keywords (as necessary) in order to extract patents in specific technical field (here, Biotechnology field).
In the patent search, it was confirmed that a high-accuracy population (i.e., a population not including non-relevant fields) of patents was obtained. Subsequently, the population was used to create the table.

By entering the Firm name or Attorney name in the "Legal Representative Name" column of Patentscope (search system of WIPO), you can find the patent information handled by each Firm.

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