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

  • Technical field:  Diagnosis (diagnosis agent/method, detecting agent/method of cancer/dementia, etc.)
  • Status:  Japanese granted patents in 2019 (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
120Shimizu Patent Office View
315Aoyama & Partners View
414Hiraki & Associates View
511Abe, Ikubo & Katayama View
77Soei Patent & Law Firm View
87YuNeed International Patent Office View
96Takashima International Patent Office View
106SAEGUSA & Partners View
116CENTCREST IP Attorneys View
125SK Intellectual Property Law Firm View
135IP Firm SHUWA View
145SHIGA International Patent Office 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, Diagnosis 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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