Daqing Sanju Energy Purification Co., Ltd. won a 5 million yuan lawsuit against BASF SE in a patent invalidation case.

Sanju Sunshine, acting on behalf of the invalidation requestor Daqing Sanju Energy Purification Co., Ltd., has requested that the patentee BASF SE's patent "Method for preparing polyhydroxymethyl compounds - 200910258005.3" be declared entirely invalid. 

At the end of 2017, Sanju Sunshine was entrusted by a domestic client to file a request for the invalidation of BASF's patent ZL200910258005.3. This patent was involved in patent infringement lawsuits related to a market worth billions of yuan annually. On November 6, 2018, the Patent Reexamination Board declared all 36 claims of the patent in question invalid.