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 2018 (registration date).
  • First country:  Foreign (i.e., patents with claiming priority of a foreign application, or patents based on PCT application whose receiving office is not 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
170SUZUYE & SUZUYE Intellectual Property Law View
251SHIGA International Patent Office View
347ITOH International Patent Office View
525Sonderhoff & Einsel View
622Nakajima & Associates IP Firm View
819Katayose Patent View
916ONDA TECHNO Intl. Patent Attys View
1115SUGIMURA & Partners View
1210Suzuran International Patent FirmNone
139S. SOGA & CO. View
149Fukami Patent Office, P.C. View
157Yamakawa International Patent Office 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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