Tsai Lee & Chen Patent Attorneys & Attorneys at Law

WTR Research

The WTR 1000 focuses exclusively on trademark practice and has firmly established itself as the definitive 'go-to' resource for those seeking world-class legal trademark expertise.

Bronze - Firms: enforcement and litigation

Silver - Firms: prosecution and strategy

Brand owners look to Tsai, Lee & Chen for advice that strikes the heart of their issues. The firm demonstrates incredible accuracy with regard to chances of success and furnishes patrons with all the information that they need to make smart decisions. Excelling in China, Taiwan and abroad, the group files thousands of trademarks annually and has an excellent track record for prosecuting applications through to grant. Its lawyers also show a deft strategic touch in litigation and dispute resolution scenarios, matching their prosecution colleagues for efficiency, reliability and success. The set’s recent work highlights the quality on offer: Crystal Chen and Nick Lan put a swift end to a dispute between client Applied Materials and Vista Applied Materials, which resulted in the latter changing its English business name. They also won a Supreme Court victory for Celine and Givenchy in which they showed their tenacity. Chen is well-established as one of the market’s leading enforcement experts and is a favourite of fashion and luxury brands. Thriving under her leadership, Lan is a rising star with impressive credentials – he speaks several languages and is admitted to the New York bar. Meanwhile, anchoring the prosecution and portfolio management practice, Yiling Liu has a refined knowledge of the approaches and tendencies of Taiwan’s and China’s IP offices and is a superb team manager and motivator. Her recent activities include winning an opposition on behalf of Takeda Pharmaceuticals.

Firm Profile

Tsai, Lee & Chen Patent Attorneys & Attorneys at Law is a top-tier IP law firm based in Taipei, Taiwan, with more than 180 full-service IP professionals and lawyers.

Firm history

Founded in 1995, Tsai, Lee & Chen Law boomed with the advent of Taiwan’s high-tech industrialisation. The firm has since developed a full-service IP law department that encompasses all areas of intellectual property in prosecution, portfolio management, litigation and licensing, among other things, with constant trust among its reputable domestic and international clientele.

Industry-sector strengths

The firm’s patent expertise – led by 40 patent attorneys licensed in Taiwan and a further 45 patent attorneys licensed in China – encompasses semiconductors, consumer electronics, thin film transistor liquid-crystal display technology, mechanical and electrical engineering, AI, financial technology, computer hardware and software, telecoms, biochemistry, pharmaceuticals, business methods and IT.

The trademark clients, on the other hand, cover a wide spectrum of industrial sectors from product manufacturers and retailers to service providers. Our professionals are sophisticated in handling trademark applications for fashion apparels, luxury products, designer fabrics, food and beverages, as well as gaming and entertainment services, among other things.

IP filing and managed portfolios

Regardless of how patent filing figures may fluctuate, the firm remains dynamic. It files more than 6,500 patent applications globally each year and 1,000 new trademark filings from domestic and international clients.

Litigation and dispute resolution

Tsai, Lee & Chen has a record of handling numerous landmark cases at the Taiwan IP Court. The types of litigation and dispute range from trademark, patent, copyright and unfair competition to breach of contract. The team is sophisticated when it comes to complex trademark enforcement issues, patent invalidation and infringement, as well as non-infringement declaratory actions.

In 2021, Tsai, Lee & Chen built a strategic alliance with a chartered accountant and hired a senior lawyer specialised in securities law. This move has expanded the firm’s capability to resolve tax disputes and other issues resulting from IP monetisation and mergers and acquisitions.

Key clients

Tsai, Lee & Chen is known for its representation of international clients, including Applied Materials, ARM Limited, Corning Inc, LVMH Group, Microsoft Corp, Nike, Qualcomm, Rimowa GmbH and Ferrari, among others.

As well as international clients, the firm is reputable among domestic industries and works for many high-tech listing companies, such as the largest semiconductor foundry worldwide, the Taiwan Semiconductor Manufacturing Company, and the reputable panel display maker, AU Optronics.

The firm’s clientele also includes companies in pharmaceuticals and medical devices, such as TSH Biopharm Corp, Takeda Pharmaceuticals and B Braun AG.

International presence and alliances

The firm remains up to date with the most recent IP law developments and challenges by actively participating in international IP groups, attending board meeting and contributing to committee meetings, as well as speaking at conferences. Tsai, Lee & Chen is a member of INTA, the American Intellectual Property Law Association, the International Association for the Protection of Intellectual Property, the Japan Intellectual Property Association, the International Federation of Intellectual Property Attorneys, the Pharmaceutical Trademarks Group, ECTA, the Intellectual Property Owners Association, the Asia Patent Attorneys Association and MARQUES.

The firm has also accumulated valuable experience and networks in China with more than 20 years of dedicated service.

In-house innovation and technology

The firm has an in-house IT team who designs and maintains its IT software and databases. Tsai, Lee & Chen uses these house-tailored technologies in daily administration, including invoicing, email communication and official formality compliance, among other things, to enhance working efficiency, reduce human error and meet clients’ demands.


  • Asialaw Leading Lawyers – Asialaw Profiles 2021;
  • Highly Recommended Firm – Asialaw Profiles 2021;
  • Leading Firm, Asia Pacific – Chambers and Partners 2021;
  • Highly Recommended Firm – IAM Patent 1000 2021;
  • Recommended Firm – WTR 1000 2021;
  • Top Tier Firm IP STARS – MIP 2021;
  • Tier 1 Firm, Patent Prosecution and Patent Contentious Category, Taiwan – Asia IP Survey 2021;
  • Tier 2 Firm, Trademark Prosecution and Trademark Contentious Category, Taiwan – Asia IP Survey 2021;
  • Tier 2 Firm – Benchmark Litigation Asia-Pacific 2021;
  • IP Law Expert of the Year, Taiwan – The Lawyer Network 2021; and
  • Patent and Trademark Prosecution Law Firm of the Year, Taiwan – Corporate INTL 2021.

Working languages

Chinese, English, Japanese, German and Korean.

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