Ying-Hua Sun is an attorney in the Intellectual Property Practice Group in the firm's Washington, D.C. office.  She manages domestic and international patent portfolios on a wide range of technologies.  Fluent in Mandarin and Cantonese, Ms. Sun frequently represents and counsels Asian Pacific clients on intellectual property, corporate and privacy matters.  Prior to law practice, Ms. Sun was a research associate at Beth Israel Deaconess Medical Center and worked on pre-clinical developments of novel HIV vaccines.  In addition to vaccine research, Ms. Sun also published work on nuclear transport of viral macromolecules.

Areas of Practice

Ying-Hua Sun’s practice areas include patent prosecution in life sciences (including organic chemistry, biochemistry, pharmacology, molecular biology, immunology, vaccines, cell biology, genetic engineering, virology, and botany) as well as in electronic and mechanical arts.  Ms. Sun has experiences drafting U.S. and international patent applications from English and Chinese technical specifications for solo inventors, start-ups, universities, mid-sized and multinational companies.  Ms. Sun has also opined on infringement and freedom to operate (FTO) issues.



  • Domestic and international patent prosecution, management, and transactions.
  • Infringement and freedom to operate opinions.
  • Asset due diligence for multimillion-dollar, cross-border transactions.
  • Participated in US litigation for a Chinese client, which ultimately resulted in a jury verdict of approximately US$26 million in favor of the client and was listed as one of the "Top 10 Plaintiffs' Verdicts by Impact" in 2013 by The Daily Journal.

* Includes some matters prior to joining Sheppard Mullin



J.D., Santa Clara University School of Law, 2013

MSc., University of British Columbia, 2006

BSc., University of British Columbia, 2003


  • District of Columbia
  • California
  • United States Patent and Trademark Office


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