Current status of extraction of tungsten in Chinese patent

The research status of tungsten extraction technique is analyzed from the perspective of Chinese patents. The patents published before 2014/03/08 with IPC C22B34/36 in CNABS are searched and studied to analyze the application type, development trend of annual application, regional distribution of applicants and main patent applicants. The patents applied and patented between the year of 2010 and 2013 are introduced to provide reference to the related enterprises and researchers.