What patent right has a protection period of 20 years?

The protection period of an invention patent is 20 years. The term of patent protection refers to the period after the patent is granted the right. According to China's patent law, inventions include three categories, namely inventions, utility models and designs. Among them, the protection period of invention patent right is 20 years, and the protection period of utility model patent right and design patent right is 10 year. This shows that once an invention is patented, it can only be protected by law for 20 years at most. After this period of time, your inventions and technological innovations will be placed in the public domain and contributed to society for free. 1. Failing to pay the annual fee as required; 2. The patentee waives his patent right in writing. In these two cases, the patent terminates, and of course there is a third case, that is, the patent expires and the protection naturally terminates. Then we finally come to the conclusion that the protection period of a patent is shorter than the patent period, the starting date is the patent application date, and the termination date depends on the patentee, but the longest time is the termination date of the patent period. It takes a certain fee to apply for a patent right, and an annual fee will be paid after obtaining the patent right. Although these expenses are not high, they should not be squandered by small and medium-sized enterprises. Especially those inventions that have no market value, it is meaningless to spend these time, energy and expenses to obtain the so-called patent right. legal ground