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

  • Technical field:  Sound (digital audio processing, tuning device, speech processing, voice search, noise cancellation, microphone, piano, electronic instrument, etc.)
  • Status:  Japanese granted patents in 2019 (registration date).
  • First country:  Foreign (i.e., patents with claiming priority of a foreign application, or patents based on PCT application whose receiving office is not 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
188ITOH International Patent Office View
273SHIGA International Patent Office View
325SUZUYE & SUZUYE Intellectual Property Law View
518Okada Patent Firm (Masahiro OKADA) View
614Ohtsuka Patent Office View
711Aoyama & Partners View
810Nakamura & Partners View
99In-house patent attorney
108Tsutsui Patent FirmN/A
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, Sound 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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