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:  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 Web
1 518 SHUSAKU・YAMAMOTO View
2 329 Aoyama & Partners View
3 310 Shimizu Patent Office View
4 276 SHIGA International Patent Office View
5 235 Abe, Ikubo & Katayama View
6 196 SEIWA PATENT & LAW View
7 174 YUASA AND HARA View
8 167 Hiraki & Associates View
9 153 Nakamura & Partners View
10 142 Sonoda & Kobayashi View
11 135 TSUKUNI & ASSOCIATES View
12 107 Kuzuwa & Partners View
13 107 SUBARU PATENT OFFICE View
14 107 Anderson Mori & Tomotsune View
15 96 Soei Patent & Law Firm View
16 93 Takaoka IP Law View
17 92 KAWAGUTI & PARTNERS View
18 75 Asamura Patent Office, p.c. View
19 73 SAEGUSA & Partners View
20 67 KIYOHARA & CO.,PATENT ATTORNEYS View
21 66 Orion Patent Office View
22 56 Takashima International Patent Office View
23 54 KYOWA PATENT AND LAW OFFICE View
24 53 HARAKENZO WORLD PATENT & TRADEMARK View
25 53 TMI Associates View
26 47 SUGIMURA & Partners View
27 47 ONDA TECHNO Intl. Patent Attys View
28 38 Unius Patent Attorneys Office View
29 38 Hirota & Associates View
30 36 YuNeed International Patent Office View
31 35 SUZUYE & SUZUYE Intellectual Property Law View
32 34 Hirota, Nagare & Associates View
33 34 Yoshikawa International Patent Office View
34 34 Nagoya International Patent Firm View
35 33 Ashida & Kimura View
36 33 HIROE AND ASSOCIATES, patent professional corporation View
37 33 In-house patent attorney
38 31 OHNO & PARTNERS View
39 30 Kita-Aoyama International Patent Bureau View
40 28 Shobayashi International Patent &Trademark Office View
41 27 Shinjyu GLOBAL IP View
42 27 SK Intellectual Property Law Firm View
43 25 SHINSEI PATENT OFFICE View
44 24 TAIYO, NAKAJIMA & KATO View
45 23 IP Firm SHUWA View
46 21 HOSODA INTERNATIONAL PATENT OFFICE View
47 20 TOKYO ACTi International Patent and Trademark Office View
48 20 Iwatani Patent Office View
49 19 Okuyama & Sasajima View
50 19 Fukami Patent Office, P.C. 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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