How to determine the optimal patent length in society

10 to 20 years. Determining the optimal patent length in society is a complex problem, which needs to consider many factors, such as the speed of technological change, the interests of patent holders and the public. In China, the length of patents varies according to the types of patents, ranging from 10 to 20 years. The setting of patent length should not only protect the innovation achievements of innovators, but also fully consider the interests of the public. If the patent length is too short, it may lead to the innovator not getting enough return, which will have a negative impact on innovation activities; If the length of the patent is too long, the progress of technological innovation may be limited, which will have a negative impact on the public interest.