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

  • Technical field:  IT (information technology, computer Software, computer program, method using software, etc.)
  • Status:  Japanese granted patents in 2021 (registration date).
  • First country:  Foreign (i.e., patents with claiming priority of a foreign application, or patents based on PCT application whose receiving office is not 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 (attorney), it was counted as being handled by the firm).
Ranking No. IP law firm Website
1 595 SHIGA International Patent Office View
2 387 ITOH International Patent Office View
3 177 Fukami Patent Office, P.C. View
4 163 SHUSAKU・YAMAMOTO View
5 153 TMI Associates View
6 133 Ohtsuka Patent Office View
7 112 Nakamura & Partners View
8 108 TANI & ABE, p.c. View
9 98 SEIWA PATENT & LAW View
10 95 Asamura Patent Office, p.c. View
11 94 RYUKA IP LAW FIRM View
12 87 In-house patent attorney
13 78 YUASA AND HARA View
14 74 Sonderhoff & Einsel View
15 70 SUGIMURA & Partners View
16 60 Sonoda & Kobayashi View
17 60 Kyosei International Patent Office View
18 58 SUZUYE & SUZUYE Intellectual Property Law View
19 56 SANSUI PATENT FIRM View
20 52 TAIYO, NAKAJIMA & KATO View
21 51 MAEDA & PARTNERS View
22 50 KYOWA PATENT AND LAW OFFICE View
23 49 ONDA TECHNO Intl. Patent Attys View
24 48 TRY International IP LAW FIRM View
25 44 PRIMEWORKS IP Attorneys View
26 44 Aoyama & Partners View
27 44 Olive International Patent Office View
28 35 Tsubame Patent Attorney Firm View
29 34 CP JAPAN IP Attorneys View
30 34 Shinjyu GLOBAL IP View
31 32 In-house patent attorney
32 32 Shobayashi International Patent &Trademark Office View
33 31 Okabe International Patent Office View
34 31 IPWIN N/A
35 30 S. SOGA & CO. View
36 29 World IP Law View
37 28 TSUKUNI & ASSOCIATES View
38 27 Yamakawa International Patent Office View
39 26 Miyoshi & Miyoshi View
40 26 HIROE AND ASSOCIATES, patent professional corporation View
41 25 Washida & Associates View
42 25 INFORT PATENT FIRM View
43 24 Soei Patent & Law Firm View
44 23 Yoshikawa International Patent Office View
45 23 KOHNO & KOHNO View
46 22 Sakai International Patent Office View
47 21 Unius Patent Attorneys Office View
48 21 M&S Partners View
49 21 Takahashi Hayashi and Partner Patent Attorneys inc. View
50 19 KAWAGUTI & PARTNERS 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, IT 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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