Tsai Lee & Chen Patent Attorneys & Attorneys at Law

Tsai Lee & Chen Patent Attorneys & Attorneys at Law is a top-tier IP firm with a 26-year history. Headquartered in Taipei, the firm employs more than 180 IP professionals and lawyers representing clients from all over the world. Our practice covers all aspects of intellectual property, including patent and trademark preparation, prosecution, portfolio management, licensing and IP litigation. The professionals at Tsai Lee & Chen provide reliable and comprehensive legal and patent services in the greater China region, while adhering to a strict code of professional ethics.

Firm history

Founded in 1995 by Thomas QT Tsai, the firm developed at pace and quickly emerged among the industry’s giants. Mr Tsai founded Tsai Lee & Chen with a group of patent professionals who were specialised in various cutting-edge areas of technology. The firm’s managing partner Victor SC Lee continues to lead Tsai Lee & Chen partners to represent Taiwanese and foreign companies in full scope of IP procurement and enforcement.

Areas of specialisation

The firm specialises in patent, design and trademark prosecution, as well as copyright registration. The legal team excels in handling IP contentious matters and disputes of unregistered rights under unfair competition law, as well as laws related to pharmaceutical patent linkage.

The firm’s patent expertise encompasses all fields of technology, including semiconductors, consumer electronics, thin-film-transistor liquid-crystal display technology, light-emitting diode technology, computer hardware and software, telecoms, biochemistry, pharmaceuticals, mechanical and electrical engineering, business methods and information technology.

International experience

Tsai Lee & Chen enjoys more than 1,300 connections with global IP law firms and associates and has accumulated valuable experience and established networks in China since the firm was founded. The firm proactively contributes to the legislation of the IP-related laws and examination guidelines in Taiwan. The firm also stays up to date with the most recent IP law developments and challenges worldwide by actively participating in international IP groups, including the American Intellectual Property Law Association, the International Association for the Protection of Intellectual Property, the Asian Patent Attorneys Association, the Japan Intellectual Property Association, INTA, the International Federation of Intellectual Property Attorneys, the Pharmaceutical Trademarks Group, the European Communities Trademark Association, the Licensing Executives Society, the Intellectual Property Owners Association and MARQUES.

Such a global vision enables the firm to advise companies with cogency and conviction – to save time and reduce costs for clients. The firm assists both domestic and international corporations in diverse industries, as well as universities and research institutions.

Professional diversity

The firm’s talented leading professionals possess diverse technical and legal backgrounds, including qualified lawyers, patent attorneys and patent agents in Taiwan, China and the United States. The litigation team has a record of handling landmark cases. It enjoys a remarkable winning rate, from the IP Court to the Supreme Court. The types of litigation cases range from trademark, patent, copyright and unfair competition to breach of contracts, while the industrial sectors cover fashion, food and drinks, as well as electronics and chemicals. Integrating the efforts of an elite team, Tsai Lee & Chen provides cost-effective patent preparation with quality work products, and has demonstrated sophistication in both offensive and defensive IP strategies in resolving IP disputes. The firm has successfully helped many Fortune 500 companies, as well as many small and medium-sized enterprises, to bridge the patent protection gap between their home jurisdiction and the greater China region.

Efficiency and quality

Supported by an in-house customised automation system, the firm can accommodate various demands from clients with minimal effort. The automation system has helped to put electronic filing into daily practice, generate e-billing codes as per clients’ preferences and reduce human error. The firm’s smooth automation management has significantly enhanced working efficiency and quality reliability.


In recognition of the firm’s excellence, Tsai Lee & Chen has been selected as a leading firm by Chambers Asia-Pacific, a top-tier patent prosecution and a leading firm in Asia-Pacific by The Legal 500, and highly recommended by the IAM Patent 1000. With a personal focus, the firm’s partners – Jesse KY Peng, Candy KY Chen and Crystal J Chen – hold various individual honours and are included among Managing Intellectual Property’s IP Stars and Top 250 Women in Intellectual Property, Asialaw’s leading lawyers and Chambers Asia-Pacific’s notable practitioners.

Working languages

The firms principal working language is Chinese. Additional working languages include English, German, Japanese and Korean.

Contact details

Tsai Lee & Chen Patent Attorneys & Attorneys at Law
11th Floor
148 Songjiang Road
Taipei 104

Professional contacts

Other offices

  • Taichung
  • Tainan

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