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 2018 (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  
11131Sakai International Patent Office View
2600ITOH International Patent Office View
3495SHIGA International Patent Office View
4406Ohtsuka Patent Office View
5384In-house patent attorney
6276In-house patent attorney
7233SUZUYE & SUZUYE Intellectual Property Law View
8212TAIYO, NAKAJIMA & KATO View
9193KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
10184Hazuki International View
11165TMI Associates View
12152Asahi Patent Firm View
13150MIZOI INTERNATIONAL PATENT FIRMNone
14139Osuga & Associates View
15130Shobayashi International Patent &Trademark Office View
16129HARAKENZO WORLD PATENT & TRADEMARK View
17126Fukami Patent Office, P.C. View
18122SUGIMURA & Partners View
19121S & S INTERNATIONAL PPC View
20119Nagoya International Patent Firm View
21119Haruka Patent & Trademark Attorneys View
22117TANI & ABE, p.c. View
23115Miyoshi & Miyoshi View
24112Isono International Patent Office, P. C. View
25111HIBIKI IP LAW FIRM View
26110SEIWA PATENT & LAW View
27105Soei Patent & Law Firm View
28105Hattori & Associates View
29104Minami Aoyama Patent and Trademark Attorneys View
30103ONDA TECHNO Intl. Patent Attys View
31100PRIMEWORKS IP Attorneys View
3298Koyo International Patent Firm View
3397Patent Attorney's Office Yoshida, Yoshitake and Arita View
3496KOHNO & KOHNO View
3593IP Firm SHUWA View
3693KYOWA PATENT AND LAW OFFICE View
3793Isshiki & Co. View
3891YKI Intellectual Property Attorneys View
3989In-house patent attorney
4088CHUO INTERNATIONAL PATENT FIRM View
4185TOU-OU PATENT FIRM View
4284Ashida & Kimura View
4384Sanno Patent Office View
4482A.SAKAI & ASSOCIATES View
4580Hori & Partners View
4675IRD Patent Office View
4774Haraguchi Internatinal Patent Office View
4872In-house patent attorney
4971Willfort International Patent Firm View
5070Seiryo Intellectual Property Corp. 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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