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Hailong Sun

Head of Patent Department | Attorney At Law | Senior Patent Attorney

Phone: +86 10 88369999

Mr. SUN Hailong is a registered patent attorney and attorney at law in China and had more than 20 years experience in the Intellectual Property field. He is a bachelor of engineering and science of China and once studied International Intellectual Property law in the US. He had handled many patent prosecution cases for Huawei, Fujitsu, LG, British telecom, FUJI Xerox, Sony Ericsson and other companies. As to patent invalidation and litigation, Mr. Sun has handled almost 30 cases for Changan unchanged, Huawei, APS Manufacturing EOOD, Sichuan Chaoren Group, Honda, Tesa ltd. and the like. Due to his experience and achievements, Mr. Sun can always get the trust from his clients.

Technical Fields

  • Communication
  • Machinery
  • Software
  • Vehicle

Practice Areas

  • Patent Prosecution
  • Patent invalidation
  • Patent litigation

Working Experience

  • Chang Tsi & Partners, Beijing, China
  • JunHe LLP
  • Beijing Sanyou Intellectual Property Agency Ltd


  • Chicago Kent College of Law     (2013-2014)
  • Beijing Beihang University (1991-1995)

Bar Examination

  • China Patent Agent (2002)
  • China Lawyer (1991)

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 200 attorneys, agents and foreign consultants. 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.