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Runjun Sun

Trademark Agent

Phone: +86 10 88369999

Mr. Runjun Sun is a trademark attorney at Beijing Office of Chang Tsi & Partners. He is mainly engaged in prosecution matters for our clients overseas in IP field.

Mr. Runjun Sun has entered IP field since the year 2009. He has handled various types of prosecution matters for our client, including application and protection of trademarks, copyright and domain name, such as trademark clearance search, trademark registration application, response to office actions, review on refusal, reply to application for opposition/non-use cancellation/invalidation/general name against our client’s trademarks, preparing and filing application for opposition/non-use cancellation/invalidation against third parties’ infringing trademarks, and correspondent administrative lawsuit related to the aforesaid cases, application for name/address change, renewal and assgnment of trademarks, recordal of trademark licensing agreement, application for regsitration of copyright and doman name, and maintenance and assighment of domain name, etc. Mr. Runjun Sun also handles enforcement matters for our client.

Professional  Experiences

  • Trademark agent, Chang Tsi & Partners, Beijing, China
  • Associate, FANG’S ASSOCIATES, Beijing, China
  • Examiner, Cooperation Center for Trademark Examination of SAIC


  • Business Administration  Jilin Agricultural Science and Technology University (2009)

Team Overview

Chang Tsi & Partners is proud of our excellent team of attorneys. Our attorneys are international, professional, well-educated and experienced in handling all types of commercial matters. Our partners include a few of the earliest legal practitioners in in China. Before they went into private practice, most of our partners served at government organs, judicial institutions, and/or big corporations and are thus very familiar with the internal mechanisms of these organizations. They also have established extensive, close contacts within these organizations. So our partners have the ability to integrate their social resources and create synergy to maximize the benefits for our clients.

Chang Tsi & Partners currently employs a total of 350 staffs, including 220 attorneys, agents and foreign consultants and others. The majority of our lawyers hold master's degrees and above, from prestigious law schools both domestic and international. Some of our lawyers have studied and/or worked abroad and have qualified as lawyers and patent agents in America and Canada.

At Chang Tsi, we highly value teamwork and cooperation. We also stress sharing of resources and experience in order to provide our clients with the best services. Their years of practice and extensive experience working with foreign firms, make our attorneys well-qualified to handle the most complicated and challenging legal matters for clients all over the world.