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 2019 (registration date).
  • First country:  Japan (i.e., (i) patents with claiming priority of a Japanese application, (ii) patents based on Japanese domestic application, or (iii) patents based on PCT application whose receiving office is Japan Patent Office without claiming any 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
1123Hiraki & Associates View
2115SHIGA International Patent Office View
378Takashima International Patent Office View
474Aoyama & Partners View
572SAEGUSA & Partners View
662Soei Patent & Law Firm View
762The Patent Corporate Body Aruga Patent Office View
847SIKs & Co. View
943IP Firm SHUWA View
1043TMI Associates View
1140TAIYO, NAKAJIMA & KATO View
1238YUASA AND HARA View
1334Abe, Ikubo & Katayama View
1432Hirota & Associates View
1532OHNO & PARTNERS View
1631KYOWA PATENT AND LAW OFFICE View
1731SEIWA PATENT & LAW View
1829YASUTOMI & Associates View
1926Shimizu Patent Office View
2026Isono International Patent Office, P. C. 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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