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Joy Li

Patent Agent

Phone: +86 10 88369999

Joy Li has over 13 years of work experience in the field of Patent for Chinese and foreign clients. As a patent attorney, Joy is mainly responsible for patent application, patent reexamination, patent invalidation, patent search and patent infringement and stability analysis. Her major technical fields include Mechanical Engineering, Electronic Engineering, Vehicle Engineering, Water Resources and Hydropower Engineering, and Computer Simulation, etc.

Pratice Areas

  • Patent Application in China
  • Patent Reexamination in China
  • Patent Invalidation in China
  • Patent Litigation in China
  • Patent Retrieval
  • Patentability Analysis
  • Patent infringement Analysis

Technical Fields

  • Mechanical Engineering
  • Electronic Engineering
  • Vehicle Engineering
  • Water Resources and Hydropower Engineering
  • Computer simulation

Years with IP Matters

  • 13  years

Professional Experiences

  • Patent attorney at Chang Tsi & Partners, Beijing, China(2020-)
  • Patent attorney, Partner of ShenDa Intellectual Property, Qingdao, China (2017-2020)
  • Patent attorney at DEQI Intellectual Property, Beijing, China (2009-2017)
  • Patent Engineer at JinYanChengXin Intellectual Property, Beijing, China (2007-2008)

Representative Clients

  • Graco
  • Airbus
  • Samsung
  • HP
  • Fisher
  • CRRC
  • CNPE
  • IWHR

Representative Cases

  • Before CRCC products enter the Indonesian market, Joy conducted patent search and infringement analysis, and presented the strategy for patent invalidation, so as to overcome all the patent obstacles.
  • Patent mining for major research and development projects.
  • Most of the patent applications for domestic and foreign clients were granted patent rights.


  • Master, Graduate School of Chinese Academy of Sciences (2004-2007)
  • Bachelor, Central South University, China (2000-2004)

Bar Admission

  • Chinese Patent Bar 2009


  • Chinese
  • English


Team Overview

With over 350 legal professionals with a diversified background, Chang Tsi & Partners offers clients deep expertise and professional experience, leading to successful legal solutions. Our attorneys are always praised for their sharp insights into the policy, and their pragmatic commercial awareness. Qualified to practice in other jurisdictions, our attorneys can maximize the profit of clients in different areas.