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

  • Technical field:  Electric communication (control device, power supply system, electric power conversion device for hybrid vehicle, etc.)
  • Status:  All (i.e., Japanese patent applications in 2016 (application date)).
  • First country:  All (i.e., patent applications with claiming priority of a Japanese application or a foreign application, or without claiming priority).
  • Count:  The number of Japanese patent applications handled by each Japanese IP law firm was counted (applicants of the patent applications are represented by each Japanese IP law firm or its members).
RankingNo.IP law firmWebsite 
11440SHIGA International Patent Office View
21309ITOH International Patent Office View
3991Sakai International Patent Office View
4932SUZUYE & SUZUYE Intellectual Property Law View
5859Ohtsuka Patent Office View
6603In-house patent attorney
7424TANI & ABE, p.c. View
8418Takanashi Patent FirmNone
9384Hazuki International View
10355In-house patent attorney
11349Nishikawa & Associates View
12285In-house patent attorney
13266KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
14257SEIWA PATENT & LAW View
15256TAIYO, NAKAJIMA & KATO View
16254SHUSAKU・YAMAMOTO View
17253Fukami Patent Office, P.C. View
18252HIBIKI IP LAW FIRM View
19246NII Patent Firm View
20233CHUO INTERNATIONAL PATENT FIRM View
21231Washida & Associates View
22226HARAKENZO WORLD PATENT & TRADEMARK View
23225Okabe International Patent Office View
24223RYUKA IP LAW FIRM View
25219SUGIMURA & Partners View
26193Miyoshi & Miyoshi View
27193Fujimoto International Patent Firm View
28192Nakamura & Partners View
29191PRIMEWORKS IP Attorneys View
30177Curiuse View
31167In-house patent attorney
32157TMI Associates View
33156Isono International Patent Office, P. C. View
34155INFORT PATENT FIRM View
35150Soei Patent & Law Firm View
36150Osuga & Associates View
37146KYOWA PATENT AND LAW OFFICE View
38146Shobayashi International Patent &Trademark Office View
39145Sano Patent Office View
40145ONDA TECHNO Intl. Patent Attys View
41144YKI Intellectual Property Attorneys View
42143Takaoka IP Law View
43137DAIDO Patent Attorneys P.C. View
44129Patent Attorney's Office Yoshida, Yoshitake and Arita View
45128TSUTSUI & ASSOCIATES View
46128Asahi Patent Firm View
47127S & S INTERNATIONAL PPC View
48124Minami Aoyama Patent and Trademark Attorneys View
49122Aoyama & Partners View
50121Nagoya International Patent 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, 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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