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

  • Technical field:  Pharmaceutical (pharmaceutical composition, medicine, API, production method of thereof, etc.)
  • Status:  Japanese granted patents in 2017 (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
1100The Patent Corporate Body Aruga Patent Office View
282Takashima International Patent Office View
375SAEGUSA & Partners View
473Hiraki & Associates View
554Aoyama & Partners View
644Soei Patent & Law Firm View
740Shimizu Patent Office View
837SIKs & Co. View
937Iwatani Patent Office View
1033SEIWA PATENT & LAW View
1131TSUKUNI & ASSOCIATES View
1228YUASA AND HARA View
1325Hirota, Nagare & Associates View
1425Abe, Ikubo & Katayama View
1522SHIGA International Patent Office View
1622In-house patent attorney
1721Moegi Patent Office View
1821TAIYO, NAKAJIMA & KATO View
1919Hirota & Associates View
2019IP Firm SHUWA View
2119LEXIA PARTNERS View
2218Eimei Patent OfficeNone
2318CENTCREST IP Attorneys View
2418In-house patent attorney
2518TMI Associates View
2615Asamura Patent Office, p.c. View
2714In-house patent attorney
2814Patent corporate body ARCO PATENT OFFICE View
2913YuNeed International Patent Office View
3013Nakamura & Partners 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, pharmaceutical 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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