Nakai & Associates (中井国際特許事務所) is an intellectual property firm in Chiyoda-ku, Tokyo, established in 1997. Our patent attorneys provide timely and attentive service, from filing and prosecuting patents, utility models, designs and trademarks in Japan to filing applications abroad.

Services

• Filing and prosecution of patent, utility model, design and trademark applications in Japan
• Foreign filings through the PCT and the Paris Convention
• Infringement opinions, and trials such as invalidation trials and correction trials
• Intellectual property searches and consulting
• Patent translation, and legal translation of contracts
• Representation in petitions to suspend imports under the Customs Tariff Act, in IP arbitration, and in negotiating license and other IP agreements

Technical Fields

Our Attorneys

Jun Nakai, Managing Patent Attorney

• Registered as a patent attorney in 1995 (Registration No. 10656); 35 years of practice
• Graduated from the Department of Mechanical Engineering, Faculty of Engineering, Hokkaido University (1980)
• Certified for patent infringement litigation (2005)

Keita Nakai, Patent Attorney

• Registered as a patent attorney in 2025 (Registration No. 23573)
• Graduated from the Graduate School of Systems and Information Engineering, University of Tsukuba (2022)

Office

Name

Nakai & Associates (中井国際特許事務所)

Established

1997

Representative

Jun Nakai

Address

4F J-Thanks No.1 Bldg., 3-1-8 Iwamotocho, Chiyoda-ku, Tokyo 101-0032, Japan

Access

2-minute walk from Exit A5 of Iwamotocho Station (Toei Shinjuku Line)
8-minute walk from JR Akihabara Station (Showa-dori Exit)
7-minute walk from JR Kanda Station (East Exit)
Map (Japanese page)

Phone

+81-3-5835-0611 (weekdays 9:00–17:00 JST)

Fax

+81-3-5835-0612

Email

info@nakaipat.jp

Contact

Inquiries in English are welcome. Please email us at info@nakaipat.jp, and we will reply within one to two business days.