Miffy Yen
Counsel Trademark Agent

During her practice in the Intellectual Property field for over 15 years, Miffy Yen has handled various cases involving trademark application, trademark opposition, trademark invalidation, as well as trademark infringement. Also, she provides Chinese and foreign clients with trademark design consultation and global trademark strategy planning.  

Ms. Yen obtained her master degree in IP law from the Seattle University, and then worked for years in US law firms, focusing on handling trademark-related cases and copyright litigations. These experiences provided her with a comprehensive and thorough understanding of the US trademark practices and US clients. Due to her familiarity with trademark policies in world`s major markets, when a client`s trademark is involved in the negotiation on global trademark portfolio, Ms. Yen always has a clear insight, and provide the clients with the immediate assistance in taking an active negotiation position to win the market share. 

During her more than 15 years of practices, Ms. Yen not only represents cases in Taiwan but also, with a broader vision, provides clients with comprehensive planning and protection in respect of the overall trademark strategies in Asia. Using her rich and unique experiences in trademark services, she can offer the IP protection services for trademark and packaging design consultation, trademark application portfolio, and trademark infringement, for worldwide transnational corporations. 

As a senior trademark legal specialist and a trademark attorney, Ms. Yen serves clients from different industries, mainly including medicine, hotel, computer, clothing, food, beer and brewery, semi-conductor, cosmetics, English-learning, football team, and famous amusement park. Moreover, she has provided legal services for various international enterprises, including Sanofi, Pfizer, Marriott, Visa, UnionPay, Gucci, Uni-President, Unilever, ASML, Liverpool FC, and several NAPA wineries. 

+86 10 8836 9999
Trademark Prosecution / Copyright & Domain Name

Years with IP Matters

2006  until now

Main Services

Taiwan trademark application 
Taiwan trademark opposition, invalidation and other cases of dispute
Taiwan trademark infringement
Trademark protection in Asian countries/regions outside Taiwan 

Professional Experiences

Eiger (2014-2017)
Lee and Li (2012– 2014)
Law Office of ME Cavanaugh (2010-2012)
Seed IP (2009-2010)
Yu-Teng Technology Co., Ltd. (2005-2008)

Representative Cases

  • Ms. Yen represented Sanofi, a French corporation, to successfully determinate these trademarks “赛诺菲” (SANOFI in Chinese), “赛诺菲及图” (SANOFI and Device in Chinese), and “SANOFI”, as famous trademarks, and to obtain the cross-class protection in the case of opposition. Ms. Yen also helped Sanofi to cancel a great number of the opposed trademarks that were in no connection with medicine and nutritional supplement.
  • Engaged as the attorney of several US innovative manufacturers in mobile phone shell, Ms. Yen submitted abundant evidence for use against individuals squatting the clients` US registered trademarks in Taiwan, and helped to withdraw nearly 400 squatted trademarks, although such trademarks had not been officially applied for registrations in Taiwan.
  • In a case of dispute settlement over ETS company`s domain name, Ms. Yen succeeded in the withdrawal of the domain name of “toeic” that had been squatted by a squatter and helped the client to obtain the domain name involved.
  • In a case of trademark infringement, by means of plagiarism, on such famous trademarks as “GG logo”,  ”Gucci” and “BOTTEGA VENETA”, Ms. Yen, on behalf of clients including Gucci, BOTTEGA VENETA and Celine, adopted negotiation and legal procedures simultaneously, and solved the disputes over trademark infringement in a timely manner.
  • In an administrative appeal, Ms. Yen, as the attorney of Pfizer, succeeded in rebutting the evidence submitted for the highly similar trademarks registered by one of the client`s previous distributors and then helped to withdraw several trademarks squatted by this previous distributor in medicine.


LLB, Soochow University
LLM, Seattle University


Trademark agent registered at Taiwan Intellectual Property Office


Mandarin Chinese