According to the provisions of China's patent law, the term of invention patent right is 20 years, and the term of utility model patent right and design patent right is 10 years, all of which are counted from the date of application. Patent protection is one-off, which means that the protection period is only so many years. During the protection period, the ownership of the patented technology belongs to the applicant. After the patent protection expires, the technology will be listed as state-owned.
In addition, the term of patent protection is not necessarily 10 year or 20 years. After the patent application is successful, the annual patent fee will be paid every year. If the annual patent fee is not paid within the specified time, the patent may become invalid, and there will be a recovery period after the patent expires. If you don't apply for restoration during the restoration period, the patent will be completely invalid. Once it expires, the patent right will be gone.