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 2021 (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).
Ranking No. IP law firm Web
1 1218 SHIGA International Patent Office View
2 855 ITOH International Patent Office View
3 700 Sakai International Patent Office View
4 608 Ohtsuka Patent Office View
5 420 SUZUYE & SUZUYE Intellectual Property Law View
6 337 In-house patent attorney
7 314 HIBIKI IP LAW FIRM View
8 279 SEIWA PATENT & LAW View
9 272 KYOWA PATENT AND LAW OFFICE View
10 245 TANI & ABE, p.c. View
11 232 NII Patent Firm View
12 227 RYUKA IP LAW FIRM View
13 217 Fukami Patent Office, P.C. View
14 209 S & S INTERNATIONAL PPC View
15 202 Washida & Associates View
16 199 Nishikawa & Associates View
17 187 TAIYO, NAKAJIMA & KATO View
18 174 In-house patent attorney
19 169 Sonoda & Kobayashi View
20 168 SHUSAKU・YAMAMOTO View
21 157 TMI Associates View
22 146 Nakamura & Partners View
23 137 INFORT PATENT FIRM View
24 134 SOCO IP LAW FIRM View
25 123 KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
26 117 Miyoshi & Miyoshi View
27 115 Okabe International Patent Office View
28 114 TSUTSUI & ASSOCIATES View
29 108 HARAKENZO WORLD PATENT & TRADEMARK View
30 105 CHUO INTERNATIONAL PATENT FIRM View
31 104 SUGIMURA & Partners View
32 99 Aoyama & Partners View
33 99 Kai-U Patent Law Firm View
34 98 Soei Patent & Law Firm View
35 95 DAIDO Patent Attorneys P.C. View
36 95 PRIMEWORKS IP Attorneys View
37 90 In-house patent attorney
38 87 Eikoh Patent Firm, P.C. View
39 87 YKI Intellectual Property Attorneys View
40 85 Asahi Patent Firm View
41 85 IP Firm SHUWA View
42 84 Isono International Patent Office, P. C. View
43 82 ONDA TECHNO Intl. Patent Attys View
44 79 Curiuse View
45 74 Nagoya International Patent Firm View
46 73 Takaoka IP Law View
47 71 Ashida & Kimura View
48 70 Fujimoto International Patent Firm View
49 69 Koyo International Patent Firm View
50 67 Serio Patent & Trademark 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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