The following table shows the ranking of Japanese IP law firm. The ranking is based on the following conditions.

  • Technical field:  Semiconductor (semiconductor chip, material, wafer, device, etc.)
  • Status:  Japanese granted patents in 2020 (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
1188SHIGA International Patent Office View
2165Fukami Patent Office, P.C. View
3164Patent Attorney's Office Yoshida, Yoshitake and Arita View
4164ITOH International Patent Office View
5140RYUKA IP LAW FIRM View
6120Sakai International Patent Office View
7119Soei Patent & Law Firm View
8105Sonoda & Kobayashi View
9102Ai Association of Patent and Trademark Attorneys View
1099TAKADA, TAKAHASHI & PARTNERS View
1199Kai-U Patent Law Firm View
1294Sonderhoff & Einsel View
1390Aoyama & Partners View
1485TSUTSUI & ASSOCIATES View
1578SUZUYE & SUZUYE Intellectual Property Law View
1677SEIWA PATENT & LAW View
1773A.SAKAI & ASSOCIATES View
1873KYOWA PATENT AND LAW OFFICE View
1971HYUGAJI & Associates View
2070TAIYO, NAKAJIMA & KATO View
2164In-house patent attorney
2261NII Patent Firm View
2360SUGIMURA & Partners View
2458YKI Intellectual Property Attorneys View
2557Nakamura & Partners View
2657Yoshimiya Patent Office View
2755HIBIKI IP LAW FIRM View
2855Polaire Intellectual Property Corporation View
2953Okabe International Patent Office View
3052YOU-I Patent Firm View
3151NICHIEI Patent and Trademark Attorneys View
3250YUWA INTERNATIONAL PATENT FIRM View
3350PRIMEWORKS IP Attorneys View
3449YOKOHAMA INTERNATIONAL PATENT LAW OFFICE View
3548ION PATENT View
3647Takahashi Hayashi and Partner Patent Attorneys inc. View
3747Katayose Patent View
3844Nishikawa & Associates View
3940Meisei International Patent Firm View
4040OKUDA & ASSOCIATES View
4139Sano Patent Office View
4239Yamakawa International Patent Office View
4335TANI & ABE, p.c. View
4434Eimei Patent OfficeN/A
4534Washida & Associates View
4633Shobayashi International Patent &Trademark Office View
4733Matsuura & Associates View
4832KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
4932TSUKUNI & ASSOCIATES View
5032Shinjyu GLOBAL IP 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, Semiconductor 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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