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Masashi Chusho

Masashi Chusho

Partner

Tokyo Office

Languages: Japanese, English, Chinese

Qualifications: 2009, Japan (Dai-Ichi Tokyo Bar Association)

Masashi Chusho’s practice focuses on intellectual property and technology-related matters. Before being admitted to the bar in 2009, he was an engineer in the R&D department of a major manufacturer of electronic components.

Practice Areas

Dispute Resolution
IP Disputes

Intellectual Property
IP Transactions
IP Disputes

Consumer Law
Product Safety, Product Compliance, Product Recall and Product Liability

Education/Professional Experience
Seminars
Publications
Topics

Education/Professional Experience

2001: The University of Tokyo (Bachelor of Liberal Arts in Quantum Science)

2003: The University of Tokyo, Graduate School of Arts and Sciences (Master of Science in Multidisciplinary Sciences)

2003 - 2006: Murata Manufacturing Co., Ltd.

2009 - 2018: Ikuta Nakoshi & Takahashi

2018 -: Nagashima Ohno & Tsunematsu

2026 - present: Partner, Nagashima Ohno & Tsunematsu

Seminars

April 16, 2026 (Thu) 14:20 - 15:10
Navigating differences and expectations at the negotiation table
- Masashi Chusho
Sheraton Hong Kong Hotel & Towers
- Dispute Resolution
- Intellectual Property
May 20, 2025 (Tue) 15:00 - 18:00
NO&T Europe Week – Day1: Recent Trends in Energy, Environment and Sustainability in Europe
- Junichi Ikeda
- Kiyoshi Honda
- Ayumi Fukuhara
Nagashima Ohno & Tsunematsu Tokyo Office
- Infrastructure/Energy/Environment
February 25, 2025 (Tue) 15:00 - 15:40
Patent enforcement in Japan: Navigating the litigation process
- Masashi Chusho
New World Makati Hotel (Manila)
- Intellectual Property
- Dispute Resolution

Publications

Newsletters

IP High Court Clarifies Limits of “Motivation to Combine” in Patent Opposition Appeal

NO&T Japan Legal Update No.52 (April, 2026)

Masashi Chusho
- Dispute Resolution
- Intellectual Property
Articles

Pantech v. ASUS: A Recent FRAND Judgment From Japan

les Nouvelles December 2025（Volume LVIII No. 4）

(December 2025)

Masashi Chusho
- Intellectual Property
- Dispute Resolution
Articles

Chambers Global Practice Guides Product Liability & Safety 2024 Japan – Law & Practice

(June 2024)

Junichi Ikeda, Takayuki Fujii, Masashi Chusho, Satoyuki Nakano (Co-author)
- Consumer Law
- Product Safety, Product Compliance, Product Recall and Product Liability
Articles

The JFTC’s Consultation Cases Related to IP License and the Anti-Monopoly Act

AIPPI Journal, July 2015 (Vol.40 No.4)

(July 2015)

Masashi Chusho

Topics

Jan 5, 2026

Announcements

Announcing New Partners, Foreign Law Partner, Counsel and Foreign Law Counsel of Nagashima
Jan 5, 2023

Announcements

Announcing New Partners, Foreign Law Partner and Counsel of NO&T
Aug 1, 2018

New Additions

Masashi Chusho, Yuwei Wang and Nicholas Josey join Nagashima Ohno & Tsunematsu

HOME
People
Masashi Chusho

Contact

Seminars

NewsLetters

Masashi Chusho

Practice Areas

Education/Professional Experience

Seminars

Navigating differences and expectations at the negotiation table

NO&T Europe Week – Day1: Recent Trends in Energy, Environment and Sustainability in Europe

Patent enforcement in Japan: Navigating the litigation process

Publications

IP High Court Clarifies Limits of “Motivation to Combine” in Patent Opposition Appeal

Pantech v. ASUS: A Recent FRAND Judgment From Japan

Chambers Global Practice Guides Product Liability & Safety 2024 Japan – Law & Practice

The JFTC’s Consultation Cases Related to IP License and the Anti-Monopoly Act

Topics

Announcing New Partners, Foreign Law Partner, Counsel and Foreign Law Counsel of Nagashima

Announcing New Partners, Foreign Law Partner and Counsel of NO&T

Masashi Chusho, Yuwei Wang and Nicholas Josey join Nagashima Ohno & Tsunematsu