Phoebe Xi
Counsel Patent Attorney

Phoebe Xi, a patent counsel and head of the Bio-Chemistry department, has been practicing patent law since 2011 and she started to work for our firm at 2014. She is highly experienced at all kinds of patent work, including drafting and prosecuting applications, challenging and defending patents before the Patent Reexamination and Invalidation Board, managing patent portfolio, developing patent filing strategies, etc. She has significant experiences on cases from a large variety of industries, such as biology, chemistry, pharmacy and chemical engineering. Before joining Changtsi, Phoebe had 3 years of work experience in research & development in a famous local energy company. 

+86 10 88369999-6027
Patent Prosecution

Practice Focus

Technical Fields


Years with IP Matters

2015 until now 

Professional Experience

Patent Attorney, Chang Tsi & Partners, Beijing, China, 2014 - Present
Patent Attorney, Jeekai & Partners, 2011 - 2014
R&D engineer, Patent Principal, Xinao Group, 2008 – 2011


Master of Science in Physical Chemistry, Taiyuan University of Technology (2008)
Bachelor of Bioengineering, Inner Mongolia University of Technology (2005)

Representative Cases

  • In a case where the examiner intended to reject the application of her client, Xi was able to successfully prove to the examiner the unexpected treatment effect obtained by the compound in the application, and finally obtained the grant of the patent. In light of this excellent work, the client transferred their remaining applications to our law office.
  • In patent reexamination cases for an American chemical company, Xi successfully and repeatedly obtained approval by the Patent Reexamination Board.

Bar Admission

Chinese Patent Bar(2015)


Mandarin Chinese