An undisclosed company from Shanxi Province filed a request for invalidation on 24 March 2011, regarding an invention patent (Patent No.: ZL 200410060988.7) titled "A Compound Chinese Medicine for Treating Gynecological Disease and Its Preparation Method", which is owned by Wuzhou Pharmaceutical Group.

Entrusted by the patent right owner, patent attorneys from CN-KnowHow conducted written response with regard to the concerning patent and attended oral proceedings before the patent re-examination board of the State Intellectual Property Office (SIPO). The patent re-examination board of SIPO made the examination decisions for this case on 08 July 2011, in which the whole of concerning patent right was ruled to be valid.

Previously, CN-KnowHow has already won all of the three invalidation cases representing Wuzhou Pharmaceutical Group. Therefore, CN-KnowHow has managed to maintain its perfect record in all the invalidation cases for Wuzhou Pharmaceutical Group.