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 2019 (registration date).
  • First country:  Japan (i.e., (i) patents with claiming priority of a Japanese application, (ii) patents based on Japanese domestic application, or (iii) patents based on PCT application whose receiving office is 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).
RankingNo.IP law firmWebsite  
11208Sakai International Patent Office View
2584ITOH International Patent Office View
3452SHIGA International Patent Office View
4379Ohtsuka Patent Office View
5303In-house patent attorney
6292In-house patent attorney
7268TAIYO, NAKAJIMA & KATO View
8220TMI Associates View
9178SUZUYE & SUZUYE Intellectual Property Law View
10160KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
11151In-house patent attorney
12146Asahi Patent Firm View
13141HIBIKI IP LAW FIRM View
14128Osuga & Associates View
15126S & S INTERNATIONAL PPC View
16125Shobayashi International Patent &Trademark Office View
17124YKI Intellectual Property Attorneys View
18123HARAKENZO WORLD PATENT & TRADEMARK View
19117Isono International Patent Office, P. C. View
20114SOCO IP LAW FIRM View
21110IP Firm SHUWA View
22109Haruka Patent & Trademark Attorneys View
23108MIZOI INTERNATIONAL PATENT FIRMN/A
24107Soei Patent & Law Firm View
25106TANI & ABE, p.c. View
26105A.SAKAI & ASSOCIATES View
27104Miyoshi & Miyoshi View
28102ONDA TECHNO Intl. Patent Attys View
29101Koyo International Patent Firm View
30100Nagoya International Patent Firm View
3199SEIWA PATENT & LAW View
3292Fukami Patent Office, P.C. View
3389Minami Aoyama Patent and Trademark Attorneys View
3485Hattori & Associates View
3585PRIMEWORKS IP Attorneys View
3685KOHNO & KOHNO View
3785Isshiki & Co. View
3883Patent Attorney's Office Yoshida, Yoshitake and Arita View
3982SUGIMURA & Partners View
4080KYOWA PATENT AND LAW OFFICE View
4179Aoyama & Partners View
4276TOU-OU PATENT FIRM View
4375Suzaku IP Attorneys View
4475IRD Patent Office View
4574Willfort International Patent Firm View
4674Seiryo Intellectual Property Corp. View
4772IP seed Patent Firm View
4868Ashida & Kimura View
4966In-house patent attorney
5066TSUTSUI & 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, 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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