When will the patent expire?

The protection period of the invention patent is 20 years, and the annual patent fee needs to be paid every year from the date of application to ensure the validity of the patent right. Specifically, Streptomyces lilacinus var. Hainan Agrobacterium and the method of preparing agricultural healthy organisms with this strain (zhongshengmycin) were patented in 2003-so if the annual patent fee is paid every year, the patent can be valid for as long as 2023.