Patent Analysis of Sulfur Autotrophic Denitrification Technology in China

In order to grasp the overall status of sulfur autotrophic denitrification related patents, and better carry out sulfur autotrophic denitrification related research and intellectual property protection, based on the SooPAT Chinese patent search engine and Baiteng.com platform, from the first patent application year to the search deadline was to analyze the number, legal status, technical field distribution, and patent value of the sulfur autotrophic denitrification patents filed in China. The results showed that the number of patents filed each year had increased rapidly since 2012. The number of patents filed in 2019 was 10 times the number of patent applications from 2001 to 2011, and the patents granted were mainly concentrated in the field of sewage (waste) water treatment, accounting for 83.64% of the total number of patents. The overall patent value was in the middle and lower level, and there were no high-value patents.