Chuancheng Chai is an intellectual property attorney and head of the IP department at Chongqing Tong'an Law Firm (重庆通安律师事务所) in the Jiangbei District of Chongqing. He holds a master's degree from Fudan University and has developed specialized expertise in patent law, trademark registration, copyright protection, anti-unfair competition, and intellectual property litigation. Attorney Chai advises both domestic and international clients on patent portfolio management, patent infringement analysis, freedom-to-operate opinions, and IP licensing negotiations. He handles patent invalidation proceedings before the China National Intellectual Property Administration and represents clients in patent infringement litigation before Chinese courts. His trademark practice covers trademark registration strategy, opposition and cancellation proceedings, trademark infringement litigation, and brand protection in the Chinese market.