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

  • Technical field:  AI (artificial intelligence, machine learning, deep learning, etc.)
  • Status:  Japanese granted patents in 2021 (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, it was counted as being handled by the firm).
Ranking No. IP law firm Web
1 241 Sakai International Patent Office View
2 109 SHIGA International Patent Office View
3 47 TAIYO, NAKAJIMA & KATO View
4 46 ITOH International Patent Office View
5 44 TMI Associates View
6 38 SUNRISE PATENT OFFICE View
7 38 SOCO IP LAW FIRM View
8 38 International Patent Office Minoru View
9 33 In-house patent attorney
10 30 Shobayashi International Patent &Trademark Office View
11 29 TOU-OU PATENT FIRM View
12 28 Fukami Patent Office, P.C. View
13 25 AIWA International Patent Agency View
14 24 NII Patent Firm View
15 23 KOHNO & KOHNO View
16 22 SUZUYE & SUZUYE Intellectual Property Law View
17 22 NAKAO & ASSOCIATES View
18 22 Seiryo Intellectual Property Corp. View
19 21 IPTech View
20 21 Sanno Patent Attorneys Office View
21 21 Kyushu International Patent Office View
22 20 Hayahara Patent & Engineering View
23 20 Ohtsuka Patent Office View
24 20 Soei Patent & Law Firm View
25 19 Isono International Patent Office, P. C. View
26 19 LEXIA PARTNERS View
27 18 Haruka Patent & Trademark Attorneys View
28 18 Willfort International Patent Firm View
29 18 BRIGHTAS IP ATTORNEYS View
30 17 HIBIKI IP LAW FIRM 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, AI 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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