Lawyer Duan possesses the professional qualifications of both a lawyer and a patent agent, and has extensive experience in handling cases related to intellectual property, civil, and administrative litigation. He has successfully handled a large number of disputes involving copyright, trademark, and patent rights.

Successful cases (partial)

 • Representing Beijing Zhenghe Island Information Technology Co., Ltd. in a dispute over the online dissemination rights of work information

 • Dispute over the infringement of the right of network dissemination of works by Beijing Aoce Business Consulting Co., Ltd., acting as an agent

 • Representing Beijing Tingtao Network Technology Co., Ltd. in a copyright infringement dispute case

 • Representing Beijing Tongxing World Information Consulting Co., Ltd. in the administrative dispute over the reexamination of trademark application rejections