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 2018 (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
11401SHIGA International Patent Office View
21089ITOH International Patent Office View
3871SUZUYE & SUZUYE Intellectual Property Law View
4700Sakai International Patent Office View
5671Ohtsuka Patent Office View
6463In-house patent attorney
7336RYUKA IP LAW FIRM View
8309SEIWA PATENT & LAW View
9266HIBIKI IP LAW FIRM View
10258Hazuki International View
11257In-house patent attorney
12246SHUSAKU・YAMAMOTO View
13222TANI & ABE, p.c. View
14188Fukami Patent Office, P.C. View
15180NII Patent Firm View
16178HARAKENZO WORLD PATENT & TRADEMARK View
17172KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
18172Okabe International Patent Office View
19167CHUO INTERNATIONAL PATENT FIRM View
20163Washida & Associates View
21159Miyoshi & Miyoshi View
22152SUGIMURA & Partners View
23151Nishikawa & Associates View
24136ONDA TECHNO Intl. Patent Attys View
25131Nagoya International Patent Firm View
26131Curiuse View
27128Soei Patent & Law Firm View
28125In-house patent attorney
29123Isono International Patent Office, P. C. View
30121Nakamura & Partners View
31120TMI Associates View
32118TAIYO, NAKAJIMA & KATO View
33111Aoyama & Partners View
34101Sanno Patent Office View
3598KOHNO & KOHNO View
3698TSUTSUI & ASSOCIATES View
3796Osuga & Associates View
3896Patent Attorney's Office Yoshida, Yoshitake and Arita View
3994Asahi Patent Firm View
4094KYOWA PATENT AND LAW OFFICE View
4193Sano Patent Office View
4293Fujimoto International Patent Firm View
4393Furuya International Patent Office View
4491S & S INTERNATIONAL PPC View
4590Ashida & Kimura View
4690Minami Aoyama Patent and Trademark Attorneys View
4788Takaoka IP Law View
4887INFORT PATENT FIRM View
4984Koyo International Patent Firm View
5084Shobayashi International Patent &Trademark 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, 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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