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

  • Technical field:  Electric communication (smartphone, cell phone, wireless network, video streaming, videoconference device, user authentication system, etc.)
  • Status:  Japanese granted patents in 2019 (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).
RankingNo.IP law firmWebsite
1631Sakai International Patent Office View
2581Ohtsuka Patent Office View
3573SHIGA International Patent Office View
4492In-house patent attorney
5400ITOH International Patent Office View
6292In-house patent attorney
7248HIBIKI IP LAW FIRM View
8177S & S INTERNATIONAL PPC View
9171Nishikawa & Associates View
10158CHUO INTERNATIONAL PATENT FIRM View
11149KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
12145HARAKENZO WORLD PATENT & TRADEMARK View
13143NII Patent Firm View
14141SUZUYE & SUZUYE Intellectual Property Law View
15123TAIYO, NAKAJIMA & KATO View
16119Isono International Patent Office, P. C. View
17117Fujimoto International Patent Firm View
18112Miyoshi & Miyoshi View
19105Nagoya International Patent Firm View
20104In-house patent attorney
21103RYUKA IP LAW FIRM View
22101TANI & ABE, p.c. View
23100SUGIMURA & Partners View
2496Fukami Patent Office, P.C. View
2596YKI Intellectual Property Attorneys View
2693IP Firm SHUWA View
2792DAIDO Patent Attorneys P.C. View
2892Patent Attorney's Office Yoshida, Yoshitake and Arita View
2988Osuga & Associates View
3087Washida & Associates View
3186Nagai & Associates View
3284PRIMEWORKS IP Attorneys View
3384Okabe International Patent Office View
3479Shobayashi International Patent &Trademark Office View
3578Asahi Patent Firm View
3677Ashida & Kimura View
3777TSUTSUI & ASSOCIATES View
3877SOCO IP LAW FIRM View
3974In-house patent attorney
4072Eikoh Patent Firm, P.C. View
4171IP seed Patent Firm View
4270Minami Aoyama Patent and Trademark Attorneys View
4369Soei Patent & Law Firm View
4467Matsuura & Associates View
4566Kai-U Patent Law Firm View
4666Furuya International Patent Office View
4765Koyo International Patent Firm View
4865KOHNO & KOHNO View
4965Sano Patent Office View
5063TNK Asia IP Attorneys 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, Electric communication 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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