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

  • Technical field:  Hybrid car (Hybrid car technology having broad facet classification: control device, power supply system, electric power conversion device for hybrid vehicle, etc.)
  • Status:  Japanese granted patents in 2019 (registration date).
  • First country:  All (i.e., patents with claiming priority of a Japanese application or a foreign application, or without claiming 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
138Ikeda Patent Office View
234Fukami Patent Office, P.C. View
332ITEC International Patent Firm View
522Watanabe International Patent Office View
618Sonoda & Kobayashi View
716YKI Intellectual Property Attorneys View
916Koh-Ei Patent Firm, P.C. View
1016AIGI Intellectual Property Law Firm View
1115Aomi Patent View
1215Seiryu International Patent FirmN/A
1313Tokyo Central Patent Firm View
1511CREO Law & Intellectual Property 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, Hybrid Car 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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