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

  • Technical field:  Medical device (syringe, stent, endoscope apparatus, X-ray imaging apparatus, etc.)
  • Status:  Japanese granted patents in 2018 (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
1177SUZUYE & SUZUYE Intellectual Property Law View
3129Toranomon Intellectual Property Firm View
4116Sakai International Patent Office View
5106In-house patent attorney
6104Ohtsuka Patent Office View
7101SHIGA International Patent Office View
974Kyoritsu Institute View
1073Tokyo International Parent Firm View
1167Koyo International Patent Firm View
1261SUGIMURA & Partners View
1357Misawa Patent, p.c. View
1455IP Firm SHUWA View
1553Washida & Associates View
1652Polaire Intellectual Property Corporation View
1751Soei Patent & Law Firm View
1846Olive International Patent Office View
1945In-house patent attorney
2045TADA, MIYAGAWA & HORII Patent, Trademark and Design Agents View
2144LUKE'S International Patent FirmNone
2236YKI Intellectual Property Attorneys View
2433Sonare IP Firm View
2533Matsuura & Associates View
2633Isono International Patent Office, P. C. View
2731Toho International Patent & Law Office View
2931Aoyama & Partners View
3031Okabe 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, Medical device 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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