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 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
11257Sakai International Patent Office View
21157ITOH International Patent Office View
31095SHIGA International Patent Office View
4482Ohtsuka Patent Office View
5393SUZUYE & SUZUYE Intellectual Property Law View
6294In-house patent attorney
7268Fukami Patent Office, P.C. View
8262TMI Associates View
9259TAIYO, NAKAJIMA & KATO View
10257In-house patent attorney
11252ONDA TECHNO Intl. Patent Attys View
12236RYUKA IP LAW FIRM View
13227TANI & ABE, p.c. View
14218Osuga & Associates View
15215HIBIKI IP LAW FIRM View
16200Hazuki International View
17193SEIWA PATENT & LAW View
18191Miyoshi & Miyoshi View
19188SUGIMURA & Partners View
20182YUASA AND HARA View
21169KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
22165Nakamura & Partners View
23154Soei Patent & Law Firm View
24150Haruka Patent & Trademark Attorneys View
25141In-house patent attorney
26141MIZOI INTERNATIONAL PATENT FIRMNone
27139Shobayashi International Patent &Trademark Office View
28139HARAKENZO WORLD PATENT & TRADEMARK View
29134Hattori & Associates View
30132YKI Intellectual Property Attorneys View
31129Aoyama & Partners View
32126SHUSAKU・YAMAMOTO View
33123Asahi Patent Firm View
34109Seiryo Intellectual Property Corp. View
35108Isono International Patent Office, P. C. View
36106PRIMEWORKS IP Attorneys View
37106KYOWA PATENT AND LAW OFFICE View
38105Koyo International Patent Firm View
39105Patent Attorney's Office Yoshida, Yoshitake and Arita View
40102Willfort International Patent Firm View
41100A.SAKAI & ASSOCIATES View
4297Nagoya International Patent Firm View
4397S & S INTERNATIONAL PPC View
4495In-house patent attorney
4594Takahashi Hayashi and Partner Patent Attorneys inc. View
4693In-house patent attorney
4793Hiraki & Associates View
4890Sonderhoff & Einsel View
4987TOU-OU PATENT FIRM View
5086Ashida & Kimura 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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