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Japan’s IP Experts 2025

31 March 2025

Japan’s IP Experts 2025

Publishers in Japan are concerned about whether the country’s copyright laws adequately protect against AI-powered search engines. An association run by Japanese mass media last year called for search engines owned by tech companies like Google and Microsoft to obtain consent from news organizations, saying that search responses often resemble news stories. 

Kyodo News reported that the Japan Newspaper Publishers & Editors Association analyzed AI search engine results and noted that such search engines sometimes return inaccurate responses and inappropriately reuse or modify articles. It called on the government to urgently review and revise laws related to IP. 

The association called out AI-powered search engine results in particularly, noting that traditional search engines provided links to stories’ original sources rather than summarizing information from multiple sources. 

In a report last fall, Kyodo News reported, “the Japan Fair Trade Commission suggested that companies operating search engines, which serve as gateways to news sites, might hold a dominant position over media companies, warning that if usage fees for articles were very low, it would pose a problem under the law.” 

A spokesperson for Google told the news agency that “Google’s services enable access to high-quality news and we have established long-term cooperative relationships with Japanese news organizations.” 

As technology continues to evolve, Japan will almost certainly be at the forefront, which suggests that there will be great demand for the professional services of intellectual property lawyers in Japan for local and overseas clients. In this issue, we pay tribute to the best of them by presenting this year’s Japan’s IP Experts list. We asked a large number of IP professionals in the region, who are mostly in-house counsel and corporate legal managers, about what they were looking for from their legal service providers, so as to understand better what clients need and want today. Based on these answers, we have compiled our list of the Top 50 IP experts in Japan, lawyers who can best understand what their clients need and provide them with the best practical advice. 

Nowadays, it takes more than a degree from a top-notch university and a couple of decades of practice for IP lawyers to convince clients that they are the best in the field. When looking for IP advice, clients would opt for outstanding lawyers who can also understand how IP impacts the rest of their business, and advise them with practical, real-world, and business-savvy solutions. Not only do the lawyers need to have sound knowledge of the current law, but they also need to perceive coming trends that might affect clients’ business. 

Our list is categorized with the specialized fields of the experts, including patents, trademarks, copyright, enforcement, licensing and franchising, media and entertainment, IT and telecoms, pharma and biotech, and IP litigation. A total of 50 top experts from 38 law firms are presented, including Japan’s largest IP firms and practices. Nakamura & Partners placed five lawyers on our list (Kei Iida, Yoshio Kumakura, Shinichiro Tanaka, Koichi Tsujii, and Kazuhiko Yoshida). Eight different firms placed two lawyers each on our list: Abe, Ikubo & Katayama (Eiji Katayama and Hiroshi Kobayashi); Anderson Mori & Tomotsune (Akihito Nakamachi and Masayuki Yamanouchi); Asamura IP (Masahiro Asamura and Yoichi Inoue); Hiroe & Associates (Masanori Hiroe and Takenori Hiroe); Mori Hamada & Matsumoto (Atsushi Okada and Yoshifumi Onodera); Shiga International Patent Office (Shinya Jitsuhiro and Yasuhiko Murayama); TMI Associates (Yoshiyuki Inaba and Shunji Sato); and Yuasa and Hara (Hiromichi Aoki and Toshiaki Iimura). In addition to the large law firms, as the legal market of Japan keeps on maturing, there are also many competent boutique firms arising. Among our top 50 list, 28 firms are represented by one lawyer. 

Most of the lawyers named to our list have multiple practice specialties. Many of them are litigators, while others concentrate on prosecution work or provide strategic advice.  

All of them have something in common: they are experts in their fields and, in one way or another, they provide extra value for their clients. They are Asia IP’s Japan IP Experts.
– GREGORY GLASS 

Japan 2024 Firm Trademarks Patents Copyright Enforcement Licensing & Franchising Media & Entertainment IT & Telecoms Pharma & Biotech IP Litigation
Takanori Abe Abe & Partners Trademarks Patents Copyright \ \ \ \ Pharma & Biotech IP Litigation
Atsushi Aoki Seiwa Patent & Law Trademarks Patents Copyright Enforcement \ \ \ \ \
Hiromichi Aoki Yuasa and Hara Trademarks \ Copyright \ \ \ \ \ \
Akiko Araki Araki International IP & Law \ Patents \ \ Licensing & Franchising \ \ Pharma & Biotech IP Litigation
Masahiro Asamura Asamura IP Trademarks Patents Copyright Enforcement Licensing & Franchising \ \ \ IP Litigation
Toshiaki Etoh Tashiro & Etoh Patent Bureau \ Patents \ \ \ \ \ \ \
Maxwell "Mac" Fox Groombridge Wu Baughman & Stone \ Patents \ \ Licensing & Franchising \ \ Pharma & Biotech IP Litigation
Tomoya Fujimoto Shiomizaka Trademarks \ Copyright \ \ Media & Entertainment \ \ IP Litigation
Kensaku Fukui Kotto Dori Law Office Trademarks \ Copyright \ \ Media & Entertainment \ \ \
Masanori Hiroe Hiroe & Associates Trademarks Patents Copyright \ \ \ \ \ IP Litigation
Takenori Hiroe Hiroe & Associates Trademarks Patents Copyright \ Licensing & Franchising \ \ \ IP Litigation
Kei Iida Nakamura & Partners Trademarks \ Copyright \ Licensing & Franchising Media & Entertainment \ \ \
Toshiaki Iimura Yuasa and Hara \ Patents Copyright Enforcement \ \ \ \ IP Litigation
Yoshiyuki Inaba TMI Associates Trademarks Patents \ \ Licensing & Franchising \ \ \ IP Litigation
Yoichi Inoue Asamura IP \ Patents \ \ \ \ \ \ \
Hitomi Iwase Nishimura & Asahi Trademarks Patents Copyright Enforcement Licensing & Franchising \ \ \ IP Litigation
Shinya Jitsuhiro Shiga International Patent Office \ Patents \ \ \ \ \ Pharma & Biotech \
Chie Kasahara Atsumi & Sakai Trademarks Patents \ \ \ Media & Entertainment IT & Telecoms \ \
Eiji Katayama Abe, Ikubo & Katayama Trademarks Patents \ Enforcement \ \ \ Pharma & Biotech IP Litigation
Hirohito Katsunuma Katsunuma International Patent Office Trademarks Patents \ \ Licensing & Franchising \ \ \ IP Litigation
Yoshitake Kihara Fukami Patent Office \ Patents \ \ \ \ \ \ \
Hiroshi Kobayashi Abe, Ikubo & Katayama \ Patents \ \ \ \ \ Pharma & Biotech \
Kumpei Kogure Borders IP Trademarks \ \ \ \ \ \ \ \
Eiichiro Kubota Kubota Trademarks Patents \ Enforcement Licensing & Franchising \ \ \ IP Litigation
Yoshio Kumakura Nakamura & Partners Trademarks Patents \ \ \ \ \ Pharma & Biotech IP Litigation
Masatoshi Kurata Suzuye & Suzuye \ Patents \ \ \ \ IT & Telecoms \ \
Masaki Mikami Marks IP Trademarks \ \ Enforcement Licensing & Franchising \ \ \ \
Manabu Miyajima Kyowa Patent and Law Office Trademarks \ \ \ \ \ \ \ IP Litigation
Hidekazu Miyoshi Miyoshi & Miyoshi Trademarks Patents Copyright \ \ \ \ \ IP Litigation
Yasuhiko Murayama Shiga International Patent Office \ Patents \ \ \ \ \ \ \
Akihito Nakamachi Anderson Mori & Tomotsune Trademarks Patents \ \ Licensing & Franchising Media & Entertainment IT & Telecoms \ \
Kenichi Nakayama Sugimura & Partners Trademarks \ Copyright \ \ \ \ \ IP Litigation
Seiji Ohno Ohno & Partners \ Patents \ \ Licensing & Franchising \ \ \ IP Litigation
Atsushi Okada Mori Hamada & Matsumoto Trademarks Patents \ Enforcement \ \ IT & Telecoms \ IP Litigation
Yoshifumi Onodera Mori Hamada & Matsumoto Trademarks Patents \ Enforcement Licensing & Franchising \ \ \ IP Litigation
Katsumasa Osaki Kawaguti & Partners \ Patents \ Enforcement \ \ \ Pharma & Biotech IP Litigation
Hideo Ozaki City-Yuwa Partners \ Patents \ \ Licensing & Franchising \ \ \ IP Litigation
Akihiro Ryuka Ryuka IP Law Firm \ Patents \ \ Licensing & Franchising \ \ \ \
Masahiro Samejima Uchida & Samejima Law Firm \ Patents \ \ Licensing & Franchising \ IT & Telecoms \ IP Litigation
Shunji Sato TMI Associates Trademarks \ Copyright Enforcement \ \ \ \ IP Litigation
Takamitsu Shigetomi Oh-Ebashi LPC & Partners Trademarks Patents \ \ Licensing & Franchising \ \ Pharma & Biotech IP Litigation
Masayuki Shobayashi Shobayashi International Patent & Trademark Office Trademarks Patents \ \ \ \ \ Pharma & Biotech \
Yoshitaka Sonoda Sonoda & Kobayashi \ Patents \ \ \ \ \ \ IP Litigation
Shinichiro Tanaka Nakamura & Partners Trademarks Patents \ Enforcement \ Media & Entertainment \ \ IP Litigation
Hideya Tsuba Tokyo Kyodo Patent Office Trademarks Patents \ Enforcement Licensing & Franchising \ \ \ IP Litigation
Koichi Tsujii Nakamura & Partners Trademarks \ \ \ \ \ \ \ \
Kozo Yabe Midosuji LPC Trademarks Patents Copyright Enforcement \ \ \ \ IP Litigation
Kensaku Yamamoto Shusaku Yamamoto Trademarks Patents \ \ Licensing & Franchising \ \ \ IP Litigation
Masayuki Yamanouchi Anderson Mori & Tomotsune \ Patents \ \ Licensing & Franchising \ \ Pharma & Biotech \
Kazuhiko Yoshida Nakamura & Partners Trademarks Patents \ \ Licensing & Franchising Media & Entertainment \ \ IP Litigation

 

Japan’s IP Experts is based solely on independent editorial research conducted by Asia IP. As part of this project, we turned to thousands of in-house counsel in Japan, Asia and around the world, as well as Japan-focused partners at international law firms, and asked them to nominate private-practice lawyers including foreign legal consultants, advisers and counsel.

The final list reflects the nominations received combined with the input of the editorial team at Asia IP, which has more than 50 years of collective experience in researching and understanding the legal market in Japan.

All private practice intellectual property lawyers working at law firms in Japan were eligible for inclusion in the nominations process; there were no fees or any other requirements for inclusion in the process.

The names of our 50 IP Experts are published here. Each IP Expert was given the opportunity to include their biography and contact details in print and on our website, for which a fee was charged.