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 2018 (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
1446SHUSAKU・YAMAMOTO View
2309Aoyama & Partners View
3297Abe, Ikubo & Katayama View
4267Shimizu Patent Office View
5242SHIGA International Patent Office View
6218SEIWA PATENT & LAW View
7208Hiraki & Associates View
8205YUASA AND HARA View
9195Nakamura & Partners View
10137TSUKUNI & ASSOCIATES View
11119SAEGUSA & Partners View
12117Takashima International Patent Office View
13111SUBARU PATENT OFFICE View
14107Soei Patent & Law Firm View
15106Kuzuwa & Partners View
16101KAWAGUTI & PARTNERS View
1798Anderson Mori & Tomotsune View
1892The Patent Corporate Body Aruga Patent Office View
1987Sonoda & Kobayashi View
2084Takaoka IP Law View
2166Orion Patent Office View
2263KYOWA PATENT AND LAW OFFICE View
2362Iwatani Patent Office View
2460Asamura Patent Office, p.c. View
2558Hirota, Nagare & Associates View
2656SIKs & Co. View
2752TMI Associates View
2847ONDA TECHNO Intl. Patent Attys View
2945Hirota & Associates View
3044OHNO & PARTNERS View
3143SK Intellectual Property Law Firm View
3241Shobayashi International Patent &Trademark Office View
3339SUZUYE & SUZUYE Intellectual Property Law View
3439KIYOHARA & CO.,PATENT ATTORNEYS View
3538Unius Patent Attorneys Office View
3638HARAKENZO WORLD PATENT & TRADEMARK View
3736LEXIA PARTNERS View
3836TAIYO, NAKAJIMA & KATO View
3936HOSODA INTERNATIONAL PATENT OFFICE View
4033Okuyama & Sasajima 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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