Sugimura & Partners

Sugimura & Partners is a Japanese intellectual property law firm formerly known as Sugimura International Patent and Trademark Attorneys. Founded in 1923 by patent attorney and engineer Nobuchika Sugimura, the firm focuses on the acquisition, protection, enforcement, and strategic management of intellectual property rights, particularly rights connected with Japan. Its work covers patent and trademark prosecution and related legal and consulting services for a broad client base that includes individual inventors, start-ups, academic institutions, Japanese businesses, and multinational corporations. The firm operates from its principal office in Tokyo and has a representative office in San Jose, California. It also works with associate firms and professional contacts in numerous jurisdictions, enabling it to coordinate international filing and enforcement matters. Reference material describes a network extending across more than 40 countries and professional relationships with firms in more than 80 countries. Its client base is described as numbering more than 200 organizations and individuals, with roughly equal proportions of Japanese and foreign clients. Sugimura’s practice is centered on Japanese patent and trademark rights, but its international orientation allows it to act as a Japanese counsel and coordination point for overseas clients entering or protecting rights in Japan. The firm’s services are relevant to technology companies, brand owners, research institutions, and inventors seeking patent prosecution, trademark registration, portfolio advice, and broader IP legal support. Its historical profile includes work associated with notable inventors, scientists, and rights holders, including Hidetsugu Yagi, associated with the Yagi–Uda antenna; Irène Joliot-Curie in connection with an atomic energy generation device matter; and Valentino Garavani in a case involving the Valentino name. The organization changed its name in 2017 from Sugimura International Patent and Trademark Attorneys to Sugimura & Partners, reflecting its broader legal-firm identity. Kenji Sugimura is identified as a principal patent attorney, while Koji Sugimura is identified as a principal attorney at law. The firm has been recognized in professional rankings and surveys covering Japanese patent prosecution, trademark prosecution, and domestic intellectual property practice, including references to World IP Survey, World Trademark Review, Intellectual Asset Management, and Asian Legal Business.

Sugimura & Partners traces its origins to 1923, when patent attorney and engineer Nobuchika Sugimura established the practice in Japan. From its beginning, the firm was organized around intellectual property work rather than general commercial law, with a particular emphasis on helping clients obtain and protect Japanese patent and trademark rights. This specialization placed the firm within Japan’s professional patent and trademark-agent tradition while also giving it a role in cross-border representation for foreign applicants and rights holders. Over the course of its development, the practice expanded its client base beyond individual inventors to include start-ups, academic institutions, Japanese companies, and international corporations. Reference material describes a client population of more than 200, divided approximately evenly between Japanese and foreign clients. The firm’s work has included both prosecution and advisory matters, allowing it to support clients from initial filing and registration through portfolio management and broader legal consultation. The firm developed an international operating model through offices in Japan and the United States, together with relationships with overseas associate firms. Its main office is located in the Kasumigaseki district of Tokyo, while a representative office is located in San Jose, California. The firm’s international network has been described as covering more than 40 countries, with professional relationships involving firms in more than 80 countries. This structure enables overseas clients to use the firm as Japanese IP counsel and enables Japanese clients to coordinate foreign filings and related matters through an established network. Sugimura’s historical work includes representation associated with notable scientific, technological, and brand-related matters. Examples identified in reference material include work for Hidetsugu Yagi, associated with the Yagi–Uda antenna; a case concerning an atomic energy generation device involving Irène Joliot-Curie; and a matter involving the Valentino name and Valentino Garavani. These examples illustrate the range of technical and brand issues handled by the practice, although the available material does not provide complete procedural or outcome details for each matter. In 2017, the organization changed its name from Sugimura International Patent and Trademark Attorneys to Sugimura & Partners. The change marked the firm’s current identity and reflected its presentation as a broader intellectual property law practice. In its current structure, Kenji Sugimura is identified as a principal patent attorney and Koji Sugimura as a principal attorney at law. The firm continues to present itself as an internationally oriented Japanese IP practice. Professional recognition has included appearances in surveys and rankings relating to Japanese patent prosecution, trademark prosecution, and domestic patent practice. Reference material cites World IP Survey, World Trademark Review, Intellectual Asset Management, and Asian Legal Business as sources of recognition. No independently verified financial, ownership, or public-company information is provided in the available material.

• 2017

  Name changed to Sugimura & Partners

  [1]Sugimura & Partnersen.wikipedia.org

  The firm adopted its current name after operating as Sugimura International Patent and Trademark Attorneys.

• 1923

  Practice founded

  [1]Sugimura & Partnersen.wikipedia.org

  Nobuchika Sugimura, a patent attorney and engineer, founded the firm in Japan.

An established Japan-focused intellectual property practice with an international client base and cross-border associate network.

• Intellectual property legal services

  Patent prosecution

  The firm advises clients on obtaining and protecting patent rights, with a particular focus on Japanese patent prosecution. Its client base includes individual inventors, technology start-ups, academic institutions, Japanese companies, and international corporations. The practice can also coordinate foreign patent matters through its overseas associate network.

• Intellectual property legal services

  Trademark prosecution

  Trademark services cover the protection and management of brands in Japan, including work for domestic and foreign rights holders. The firm has been recognized in professional coverage of Japanese trademark prosecution and supports clients requiring local counsel and international portfolio coordination.

• Cross-border legal services

  International IP coordination

  Through its United States representative office and relationships with associate firms in many jurisdictions, Sugimura & Partners coordinates international patent and trademark matters. The network is described as extending across more than 40 countries, with professional relationships in more than 80 countries.

• Legal advisory services

  IP consultation

  The firm provides consultation concerning the acquisition, protection, and strategic handling of intellectual property rights. The available reference material identifies consultation as a core part of the practice but does not provide a detailed service catalogue.

• 2017

  Adoption of the Sugimura & Partners nameStrategy

  Background

  The practice had previously operated under the name Sugimura International Patent and Trademark Attorneys and was known for Japanese and international patent and trademark work.

  Action taken

  The firm changed its name to Sugimura & Partners.

  Aftermath

  The new name became the firm’s current identity while its Japan-centered intellectual property practice and international network continued.

  Source

1. 1Sugimura & Partnersen.wikipedia.org