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

  • Technical field:  Pharmaceutical (pharmaceutical composition, medicine, API, production method of thereof, 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
1 541 SHUSAKU・YAMAMOTO View
2 401 Aoyama & Partners View
3 354 Shimizu Patent Office View
4 338 SHIGA International Patent Office View
5 269 Abe, Ikubo & Katayama View
6 243 Hiraki & Associates View
7 218 SEIWA PATENT & LAW View
8 209 YUASA AND HARA View
9 177 SAEGUSA & Partners View
10 164 Nakamura & Partners View
11 163 TSUKUNI & ASSOCIATES View
12 142 Sonoda & Kobayashi View
13 134 Soei Patent & Law Firm View
14 129 Takashima International Patent Office View
15 120 Kuzuwa & Partners View
16 119 SUBARU PATENT OFFICE View
17 111 Anderson Mori & Tomotsune View
18 98 KAWAGUTI & PARTNERS View
19 93 Takaoka IP Law View
20 86 Asamura Patent Office, p.c. View
21 75 The Patent Corporate Body Aruga Patent Office View
22 74 TMI Associates View
23 69 Orion Patent Office View
24 69 KIYOHARA & CO.,PATENT ATTORNEYS View
25 69 KYOWA PATENT AND LAW OFFICE View
26 61 HARAKENZO WORLD PATENT & TRADEMARK View
27 60 OHNO & PARTNERS View
28 60 Hirota & Associates View
29 60 LEXIA PARTNERS View
30 57 IP Firm SHUWA View
31 56 ONDA TECHNO Intl. Patent Attys View
32 54 Unius Patent Attorneys Office View
33 53 SIKs & Co. View
34 52 YuNeed International Patent Office View
35 52 Hirota, Nagare & Associates View
36 49 Iwatani Patent Office View
37 48 SUGIMURA & Partners View
38 47 Shobayashi International Patent &Trademark Office View
39 41 Ashida & Kimura View
40 41 HOSODA INTERNATIONAL PATENT OFFICE View
41 41 Nagoya International Patent Firm View
42 38 SUZUYE & SUZUYE Intellectual Property Law View
43 36 Ochanomizu International Patent Office View
44 34 Yoshikawa International Patent Office View
45 33 HIROE AND ASSOCIATES, patent professional corporation View
46 33 In-house patent attorney
47 31 SK Intellectual Property Law Firm View
48 31 TAIYO, NAKAJIMA & KATO View
49 30 Kita-Aoyama International Patent Bureau View
50 29 HATTA & ASSOCIATES 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, Pharmaceutical 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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