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 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
1203Fukami Patent Office, P.C. View
2191TSUTSUI & ASSOCIATES View
3184SHIGA International Patent Office View
4183Patent Attorney's Office Yoshida, Yoshitake and Arita View
5162ITOH International Patent Office View
6135Soei Patent & Law Firm View
7132Sakai International Patent Office View
8118SEIWA PATENT & LAW View
9113TAIYO, NAKAJIMA & KATO View
10107Sonderhoff & Einsel View
11107SUZUYE & SUZUYE Intellectual Property Law View
12101Aoyama & Partners View
1399TAKADA, TAKAHASHI & PARTNERS View
1492KYOWA PATENT AND LAW OFFICE View
1587RYUKA IP LAW FIRM View
1681Ai Association of Patent and Trademark Attorneys View
1775HYUGAJI & Associates View
1873Kai-U Patent Law Firm View
1972Nakamura & Partners View
2071Sonoda & Kobayashi View
2170YOU-I Patent Firm View
2266HIBIKI IP LAW FIRM View
2364Prezio IP Firm View
2463A.SAKAI & ASSOCIATES View
2561In-house patent attorney
2661Miyoshi & Miyoshi View
2756ION PATENT View
2854ONDA TECHNO Intl. Patent Attys View
2954Meisei International Patent Firm View
3053Yoshimiya Patent Office View
3153PALMO PATENT FIRM View
3250YOKOHAMA INTERNATIONAL PATENT LAW OFFICE View
3348YKI Intellectual Property Attorneys View
3447TANI & ABE, p.c. View
3546Ohtsuka Patent Office View
3646Kyosei International Patent Office View
3743Unius Patent Attorneys Office View
3842KOKUBUN INTERNATIONAL PATENTS & TRADEMARKS View
3942Shobayashi International Patent &Trademark Office View
4042AICHI, Takahashi, Iwakura & Associates View
4140Takahashi Hayashi and Partner Patent Attorneys inc. View
4240Polaire Intellectual Property Corporation View
4340PRIMEWORKS IP Attorneys View
4439In-house patent attorney
4539In-house patent attorney
4639Isono International Patent Office, P. C. View
4738Washida & Associates View
4838Ohtani Patent Office View
4938YUASA AND HARA View
5037NICHIEI Patent and Trademark Attorneys 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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