Mr. Sun is dually qualified as Patent Attorney and Attorney at law. He joined Unitalen Beijing in 2004 and handled mainly patents cases involving patent prosecution, review and invalidation, patent civil litigations, patent administrative litigation, etc., including thousands of patent applications, hundreds of patent review and invalidation cases and several dozens of typical patent infringement litigations and patent administrative litigations. In particular, Mr. Sun has abundant practical experience in patent invalidation and patent civil litigations as well as patent administrative litigations.