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

  • Technical field:  Pigment/Dye (inkjet technology, colored composition, color filter, 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
139In-house patent attorney
228SIKs & Co. View
323Yoshida & KondoNone
419In-house patent attorney
518Tsujimaru International Patent Office View
715Ohtani Patent Office View
815Miyoshi & Miyoshi View
914Koh-Ei Patent Firm, P.C. View
1012Gyoen Patent Firm View
1112Tokyo Central Patent Firm View
1211I.F. PARTNERS Patent Attorneys View
1311Hirota, Nagare & Associates View
1410SHIGA International Patent Office View
159Eikoh Patent Firm, 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, Pigment/Dye 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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