IP Dispute (litigation, arbitration, customs action) | Intellectual Property | Services

IP Dispute (litigation, arbitration, customs action)

Intellectual Property

IP Dispute (litigation, arbitration, customs action)

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IP Litigation We have substantial experience in representing both proprietors (plaintiffs) and alleged infringers (defendants) in litigation and preliminary injunction proceedings preceding or concurrent to that, for infringement of patent, trademark, and design rights, copyrights, know-how, and other IP rights brought before the Tokyo and Osaka District Courts and other courts. We handle these matters using cross-functional teams consisting of litigation attorneys (bengoshi), patent attorneys (benrishi), and other specialists inside and outside AMT in accordance with the relevant technical fields. Advisory Opinions (hantei) and Trials (shimpan) before the Japan Patent Office We have significant experience in representing both claimants and respondents in advisory opinion proceedings (hantei) as well as in trials (shimpan) before the Japan Patent Office. Our experience includes representing clients in ex parte and inter parte proceedings before the Intellectual Property High Court of Japan seeking the revocation of trial decisions rendered by the Japan Patent Office. During these procedures, it is important to keep in mind the relationship with patent infringement litigations that take place in court. Customs Actions We have considerable experience in representing claimants and alleged infringers (respondents and/or importers) in customs actions and border detentions where an injunction has been sought from the Japan Customs Office to halt the importation of products that allegedly infringe on IP rights. Unfair Competition Litigation We have vast experience in representing both proprietors (plaintiffs) and alleged infringers (defendants) in unfair competition litigation brought before the Tokyo and Osaka District Courts and other courts, as well as negotiations that precede such litigation. Inventor Remuneration Litigation and IP Ownership Litigation We have extensive experience in representing employers in inventor remuneration litigation along with the negotiations that precede said litigation. Furthermore, we have significant experience litigating IP ownership disputes as well as the negotiations that precede such litigation. License Agreement, Joint Development, and Content Utilization Litigation/Dispute Resolution We have substantial experience in representing clients in litigation and arbitration regarding license agreements, joint development, and content utilization. In developing an appropriate resolution for these disputes, we take into consideration not only the underlying contractual issue and procedural law but also analyze antitrust and other relevant laws. IP Infringement and/or Validity Opinions We have a wide range of experience in rendering opinions regarding infringement and/or validity of IP rights, including patents. Our opinions are provided to ensure so called “Freedom of Operation,” and prepare for anticipated litigation and license negotiations. Moreover, we regularly assist our clients in seeking similar opinions on foreign patents from attorneys in other jurisdictions.

INSIGHTS

[WTO and International Trade Case Review Series No. 45] China – Measures Concerning Intellectual Property Rights (WT/DS611/11,WT/DS611/ARB25): “Anti-suit injunctions” in standard-essential patent disputes and the reach of the TRIPS Agreement —

2026.10.01

Naoko Takasaki

Intersection of IP Law Practice and Other Areas of Law

2026.09.28

Wataru Shimizu

Yutaka Shimoo

Takeshi Ishida

Yusuke Sahashi

Kanako Watanabe

Hiroyuki Saga

…

Japan: ensuring success under the trademark enforcement framework

2026.08.10

Masayuki Yamanouchi

Yuta Oishi

Koki Sasaki

Satoko Yokogawa

IP & Technology Newsletter Vol.3 (2026)

2026.05.21

Nobuto Shirane

Shogo Tsunoda

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PROFESSIONALS

YasufumiShiroyama

Tokyo

Partner

Tokyo

Partner

Contact

Yasufumi Shiroyama is a partner who heads all aspects of the firm's intellectual property group practice, including: ・Drafting and arguing complaints, motions, answers and other pleadings for patent, trademark, copyright and know-how infringement litigation in district and appellate courts in Japan, on behalf of both Japanese and foreign companies; ・Drafting and arguing complaints, motions, answers and other pleadings for litigation arising in relation to technology transfer agreements, compensation for employee's invention, and allegedly defective products, etc. in district and appellate courts in Japan, on behalf of both Japanese and foreign companies; ・Drafting and negotiating various technology transfer agreements on behalf of both Japanese and foreign companies; ・Managing written discovery in cooperation with U.S. counsel for a Japanese client in patent license related litigation in U.S. federal court; ・Managing appellate litigation matters seeking nullification of decisions of the Japanese Patent Office; ・Drafting and arguing complaints, motions, answers and other pleadings in invalidation trial and opposition procedures before the Japanese Patent Office; and ・Advising on regulatory matters for pharmaceutical products, medical devices, chemical products, and personal data etc.

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YoshikazuIwase

Tokyo

Partner

Tokyo

Partner

Contact

Yoshikazu Iwase joined Anderson Mori & Tomotsune after working with an intellectual property firm in Tokyo for three years. His litigation experience involves a number of patent infringement trials and revocation suits against the trial decisions of the Japanese Patent Office concerning patentability/validity of patents over various technologies. He has also been involved with a wide range of trademark/trade dress and copyright infringement suits, licensing and IP assets transfer transactions, and dispute resolution. Mr. Iwase has provided a wide range of advice regarding U.S. patent infringement issues in Japan. His experience also includes drafting and negotiating licensing, patent and various intellectual property transfer agreements, transactions and due diligence of intellectual property in the course of M&A deals.

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MikiGoto

Tokyo

Osaka

Partner

Tokyo

Osaka

Partner

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Mr. Goto has an exceptional background as a Japanese lawyer with an academic background in both science and engineering, and professional experience working in the intellectual property department of a major electronics company. Mr. Goto’s practice covers a wide range of complex intellectual property and technology/data related matters, including disputes concerning patents, licensing, trade secrets, trademark and technology related antitrust claims, as well as various data privacy/protection issues. He also has broad experience in various regulatory matters as well as product liability issues involving chemical substances, pharmaceutical products and other industrial products. Mr. Goto is recommended for: ・Intellectual Property (Japan) - Chambers Global (2019-2026) ・TMT (Technology, Media, Telecom) - The Legal 500 Asia Pacific (2021-2026) ・Intellectual Property (Japan) - Asialaw Profiles (2021-2026) Since 2017, Mr. Goto has been serving as the vice chair of Standing Committee on Trade Secret of AIPPI. In addition to being admitted to the bar in Japan (2008) and the state of New York (2014), he passed the Japanese Patent Attorney Examination in 2003.

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MasayukiYamanouchi

Tokyo

Partner

Tokyo

Partner

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Masayuki holds a master's degree in science, and has been engaged in a number of patent infringement lawsuits and other IP related matters since he became a lawyer. His main focus is on the pharmaceutical industry, in patent infringement actions as well as licensing negotiations, joint development projects, and technology transfer projects. He also has expertise and experience in other forms of intellectual property, including trademarks, copyrights, and trade secrets. In addition, with his experience in the U.S. (both in law school and at a law firm focusing on patent matters), he also provides advice to clients involved in patent lawsuits in the U.S.

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RyoMurakami

Tokyo

Partner

Tokyo

Partner

Contact

Contact Click here for details

AkihitoIshii

Tokyo

Special Counsel

Tokyo

Special Counsel

Contact

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TakashiOkamoto

Tokyo

Patent Attorney (benrishi)

Tokyo

Patent Attorney (benrishi)

Contact

Mr. Okamoto is a registered and qualified patent attorney (benrishi). He has been involved with various patent matters and is well versed in international and domestic patent filing and prosecution. He is specialized in Mechanical devices, Life Science and Food Engineering.

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YutaOishi

Tokyo

Partner

Tokyo

Partner

Contact

Yuta Oishi has engaged in a wide range of IP related matters, including patent, copyright, and trademark infringement lawsuits, licensing negotiations, as well as technology related projects. Moreover, He specializes in data related business and has provided an extensive variety of advice regarding data protection, cyber security, and trade secrets. In addition, he possesses a vast array of experience in assisting with transactional, regulatory, and other legal matters in fields that pertain to and expand across the pharmaceutical, healthcare (including digital healthcare), IT, and entertainment industries.

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TomokazuTakahashi

Tokyo

Patent Attorney (benrishi)

Tokyo

Patent Attorney (benrishi)

Contact

Tomokazu Takahashi is an experienced trademark attorney, regularly represents both local and international clients for a wide range of trademark proceedings. His practice covers trademark prosecution; clearance searches; opposition, cancellation and invalidation proceedings; enforcement; design prosecution; and IP licensing and assignment.

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ToshiyukiOishi

Tokyo

Patent Attorney (benrishi)

Tokyo

Patent Attorney (benrishi)

Contact

Mr. Oishi has been involved with patent-related matters and is well-versed in domestic and foreign patent applications and in registration procedures, the preparation of trial case documents, legal research and the preparation of expert opinions, and litigation matters. His industries of special expertise include the electrical, electronics, telecommunications, semiconductors, mechanical devices, software, and computer industries.

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YoheiOgasawara

Tokyo

Patent Attorney (benrishi)

Tokyo

Patent Attorney (benrishi)

Contact

Dr. Ogasawara is a registered and qualified patent attorney (benrishi). He has been involved with various patent matters and is well versed in international and domestic patent filing and prosecution. He is specialized in Genetic engineering, Pharmaceuticals, Food, Microbiology, Regenerative medicine, Distillation/Extraction, Batteries, Optical devices.

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PROFESSIONALS