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 2017 (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).
RankingNo.IP law firmWebsite
1504SHUSAKU・YAMAMOTO View
2317Aoyama & Partners View
3298Abe, Ikubo & Katayama View
4282Shimizu Patent Office View
5241Hiraki & Associates View
6228Nakamura & Partners View
7220SHIGA International Patent Office View
8210SEIWA PATENT & LAW View
9184YUASA AND HARA View
10155TSUKUNI & ASSOCIATES View
11137Takashima International Patent Office View
12125Soei Patent & Law Firm View
13123SAEGUSA & Partners View
14111KAWAGUTI & PARTNERS View
15108SUBARU PATENT OFFICE View
16105Sonoda & Kobayashi View
17103The Patent Corporate Body Aruga Patent Office View
1899Anderson Mori & Tomotsune View
1979Asamura Patent Office, p.c. View
2079Takaoka IP Law View
2179Kuzuwa & Partners View
2277TMI Associates View
2368KYOWA PATENT AND LAW OFFICE View
2464Iwatani Patent Office View
2560Hirota, Nagare & Associates View
2660HARAKENZO WORLD PATENT & TRADEMARK View
2760Orion Patent Office View
2856OHNO & PARTNERS View
2946Kita-Aoyama International Patent Bureau View
3045KIYOHARA & CO.,PATENT ATTORNEYS View
3145SUZUYE & SUZUYE Intellectual Property Law View
3245Hirota & Associates View
3345YuNeed International Patent Office View
3445IP Firm SHUWA View
3544SIKs & Co. View
3644In-house patent attorney
3738ONDA TECHNO Intl. Patent Attys View
3837HOSODA INTERNATIONAL PATENT OFFICE View
3936Unius Patent Attorneys Office View
4035Moegi Patent Office 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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