Denny Duan
Patent Attorney

As a patent attorney at Chang Tsi & Partners, Denny Duan can offer patent agent services in English. Before joining Chang Tsi & Partners, Mr. Duan worked as a patent attorney in patent agencies for more than 9 years, and was mainly responsible for dealing with patent application, response to patent examination opinions, patent reexamination, and patent invalidation matters. He has obtained rich experience in patent practices. He also offered related consultation services, especially for foreign customers.

Mr. Duan has been engaged in patent matters since 2011, and has served many foreign and domestic famous enterprises

+86 10 88369999
Patent Prosecution
Beijing / Taiwan

Practice Focus

Technical Fields

Patent application
Response to patent examination opinions
Patent reexamination
Patent invalidation
Patent consultation

Years with IP Matters

2011 until now

Professional Experience

Patent attorney, Chang Tsi & Partners, Beijing, China

Patent attorney, Sanyou Intellectual Property Agency Ltd., Beijing, China

Patent attorney, China PAT, Beijing, China


Master of Engineering, Beihang University (2007)
Bachelor of Engineering, Nanhua University (2003)

Bar Admission

Chinese Patent Bar (2018)


Mandarin Chinese