The protection period of an invention patent is 20 years, calculated from the date of application, and an annual patent fee needs to be paid every year to ensure that the patent right is valid.
Specifically, the Hainan variant of Streptomyces lilacinus and the method for preparing agricultural health organisms from this strain (that is, Zhongshengmycin) were patented in 2003 - so this patent is paid every year In the case of patent annual fees, the validity period is up to 2023.