About Us | Firm Profile


Tsai, Lee & Chen Patent Attorneys & Attorneys at Law is a top-tier IP law firm based in Taipei, Taiwan, with more than 160 IP professionals and lawyers.

Firm history

Founded in 1995 by Thomas QT Tsai, the firm boomed with the advent of Taiwan's high-tech industrialisation. Mr Tsai is a respected leading patent professional in Taiwan, who founded Tsai, Lee & Chen with a group of patent professionals specialised in various cutting-edge technological areas. He is the former president of both the Asian Patent Attorneys Association Taiwan Group and the Taiwan Association of Information Technology and Intellectual Property, and the founding president of the Taiwan Patent Attorneys Association. The firm has since developed a full-service IP law department that encompasses all areas of intellectual property, from prosecution to litigation. The trademark department is highly trusted among its reputable domestic and international clientele.

Areas of specialisation

Tsai, Lee & Chen's practice covers all aspects of IP law, including patent and trademark application preparation, prosecution, portfolio management, litigation, licensing and contentious matters.

The firm's patent expertise, led by 43 patent attorneys licensed in either Taiwan or China, encompasses the fields of semiconductors, consumer electronics, thin film transistor liquid crystal display technology, light-emitting diode technology, computer hardware and software, telecommunications, biochemistry, pharmaceuticals, mechanical and electrical engineering, business methods and information technology. Its patent advisory service is known to be reliable, comprehensive and ethically oriented.

The firm's trademark team, along with its attorneys at law, is known for its high level of attentiveness and responsiveness towards each of its clients and cases. In addition to specialising in Taiwanese trademark practice, the firm's seasoned professionals have managed global trademark protection for its domestic clients. The lawyers at Tsai, Lee & Chen have gained a reputation for their efficiency, reliability and comprehensive legal opinions, as well as their strategic advice on dispute resolution and litigation. The firm also enjoys an outstanding success rate in overcoming citations, oppositions, invalidations and infringement litigations.

International experience

Tsai, Lee & Chen manages more than 30,000 patents and 18,000 trademarks worldwide and has established 1,300 professional networks with global IP law firms and associates.

The firm stays up to date with the most recent IP law developments and challenges by actively participating in international IP groups, including the American Intellectual Property Law Association, the International Association for the Protection of Intellectual Property, the Japan Intellectual Property Association, the International Trademark Association, the International Federation of Intellectual Property Attorneys, the Pharmaceutical Trademarks Group, the European Communities Trademark Association, the Intellectual Property Owners Association, the Licensing Executives Society and MARQUES.

The firm has also accumulated valuable experience and networks in China with more than 16 years' dedication.

Professional diversity

The firm's leading patent attorneys have diverse technical and legal backgrounds. Some possess dual qualifications in Taiwan, China and the US Patent and Trademark Office. The firm's domestic and foreign lawyers are familiar with cross-border legal practices and are licensed to practise in Taiwan, China and New York State.


  • Awarded Firm of The Year 2014 – Taiwan by Managing Intellectual Property;
    nominated a 4th time in 2017.
  • Listed as a Tier 1 Firm – Patent Prosecution by Managing Intellectual Property in 2017
    for the 7th consecutive year.
  • Listed as a Recommended Firm by the IAM Patent 1000 in 2017.
  • Listed as both a Silver Firm for trademark prosecution and strategy and a Recommended Firm by the WTR 1000 in 2017.
  • Listed as a Leading Firm – Asia Pacific by The Legal 500 in 2017.
  • Listed as an Highly Recommended firm by Asialaw Profiles in 2017.
  • Listed as a Tier 1 Firm – Patent Prosecution in Taiwan by Asia IP in 2017.

Working languages

Chinese, English , Japanese, German, and Korean

  11th F1., 148 Songjiang Rd., Taipei, Taiwan | Tel : 886-2-2571-0150 | Fax : 886-2-2562-9103 | Email : info@tsailee.com.tw
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