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

  • Technical field:  Electronic circuit (electronic circuit device/component, semiconductor integrated circuit, 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
150KATAYAMA & PARTNERS View
248Sakai International Patent Office View
339In-house patent attorney
439Miyazaki & Metsugi View
538Sanno Patent Office View
630I.F. PARTNERS Patent Attorneys View
728Sato International Patent Firm View
826ASAHI & MASUDA PATENT & TRADEMARK ATTORNEYS View
926NII Patent Firm View
1026Fukami Patent Office, P.C. View
1126TMI Associates View
1226SHIGA International Patent Office View
1324In-house patent attorney
1423Sohshin International Patent Office View
1523KYOWA PATENT AND LAW OFFICE View
1622HIBIKI IP LAW FIRM View
1721Miyoshi & Miyoshi View
1821TAIYO, NAKAJIMA & KATO View
1920SOCO IP LAW FIRM View
2020Yamakawa International Patent Office View
2119Kaede Patent Attorneys' Office View
2219ITOH International Patent Office View
2318TAKADA, TAKAHASHI & PARTNERS View
2417Sano Patent Office View
2517SEIWA PATENT & LAW View
2616Soei Patent & Law Firm View
2716Aoyama & Partners View
2815In-house patent attorney
2913Hattori & Associates View
3012TSUTSUI & ASSOCIATES View
3112RIVERFLOW international patent firm View
3212In-house patent attorney
3312KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
3411SUZUYE & SUZUYE Intellectual Property Law View
3511In-house patent attorney
3611YKI Intellectual Property Attorneys View
3711Polaire Intellectual Property Corporation View
3811Ohtsuka Patent Office View
3911LEXT, P.C. View
4011SUGIMURA & 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, electronic circuit 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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