About Us | Firm Profile

The firm

Founded in 1995 by Thomas QT Tsai, the firm boomed with the advent of Taiwan’s high-tech industrialization. Mr Tsai is an eminently respected, leading patent professional in Taiwan, who founded Tsai, Lee & Chen with a small group of highly qualified patent professionals, specializing in a myriad of cutting-edge technological areas. He was the president of the Asian Patent Attorneys Association Taiwan Group and the Taiwan Association of Information Technology and Intellectual Property, as well as the founding president of the Taiwan Patent Attorneys Association. The firm has since developed a full service IP law practice encompassing all areas of IP from prosecution to litigation, garnering tremendous trust from its reputable domestic and international clientele.

Areas of practice

The firm’s patent expertise encompasses the fields of semiconductors, consumer electronics, TFT-LCD technology, LED technology, computer hardware and software, telecommunications, biochemistry, pharmaceuticals, mechanical and electrical engineering, business methods, and information technology.

Tsai Lee & Chen manages more than 30,000 international patents and has established 1,300 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 AIPLA, AIPPI, APAA, JIPA, INTA, FICPI, PTMG, ECTA, LES, IPO, MARQUES and others. The professionals at Tsai Lee & Chen provide reliable and comprehensive legal and patent services in the greater China region, all while adhering to a strict code of professional ethics.

The firm’s leading talent have diverse technical and legal backgrounds, and include qualified lawyers, patent attorneys and patent agents in Taiwan, the People’s Republic of China and even in the US. With a team of elites, Tsai Lee & Chen is able to provide cost-effective patent preparation for both Taiwan and China, is fully capable of preparing US patent specifications for companies that would like to file in the US, and demonstrates sophistication in both offensive and defensive IP strategies when advising on IP dispute resolution. The firm has successfully assisted many Fortune 500 companies, as well as many small and medium enterprises, to bridge the gap of patent protection between their home jurisdiction and the Greater China region.

Practice area expertise



Founded in 1995 by Thomas QT Tsai, Esq, the firm strived to stand out in a relatively short time. Managing partner Thomas QT Tsai, Esq is a highly esteemed, leading patent professional in Taiwan. Prior to establishing this firm, he was a founding partner of one of the largest local IP firms. Motivated by the rise of Taiwan’s hi-tech industries in the 1990s, which included the fast development of electronic and semiconductor-related technologies.


  • Tsai Lee & Chen was awarded Firm of The Year 2014 - Taiwan and again nominated in 2016 by Managing Intellectual Property; it was also listed as a Tier 1 Firm for Patent Prosecution.

  • The IAM Patent 1000 listed Tsai Lee & Chen as a Recommended Firm in 2016.

  • The WTR 1000 listed Tsai Lee & Chen as a Silver Firm for trademark prosecution and strategy; and as a Recommended Firm in 2016.

  • The Legal 500 selected Tsai Lee & Chen as a Leading Firm - Asia Pacific in 2017.

  • The asialaw PROFILES listed Tsai Lee & Chen as a Highly Recommended firm in 2017.


Working languages

Chinese, English and Japanese.


  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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