Yiling Liu

Ranked in Taiwan
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

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Yiling Liu's Profile

Yiling Liu is the deputy manager and chief of trademark section at Tsai, Lee & Chen. She manages a team of 15 trademark professionals and supporting staffs. Her areas of specialisation focus on trademark applications and prosecution, domain names and disputes resolution, trademark clearance searches, oppositions, cancellations, and invalidations. She is proficient in not only trademark practices of Taiwan IP Office but also the practices of China Trademark Office, SIPO where many clients would demand for advices.

Yiling has an LLB degree from Chinese Culture University, an LLM degree in comparative law from Indiana University School of Law, and an LLM degree in intellectual property from the University of New Hampshire School of Law (formerly the Franklin Pierce Law Center). She is a member of INTA, the Pharmaceutical Trademarks Group and MARQUES.

Yiling and her team have managed voluminous trademark portfolios for domestic and international entities, including many multinational companies such as Ansell Limited, Ezaki Glico Co Ltd, IOXT LLC, Takeda Pharmaceutical, Red Bull AG and Topre Corporation. Yiling was a winner of the Client Choice award for Taiwan in 2015. She is also the co-author of the article “Trademarks in Taiwan”, the Taiwan Chapter of Lexology Getting The Deal Through (www.lexology.com/gtdt): Trademarks Edition in 2020.

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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