in order to promote scientific and technological progress and reduce duplication of research, the state has established a patent system to grant patent protection to qualified inventions. Without the permission of the patentee, others may not produce, sell, use or promise to sell patented products (or products obtained by patented methods).
The price paid by the patentee is the monopoly right in a certain time and region.
The benefit for the public is that they can learn about the existing inventions, so as to avoid repeated development and reduce waste, and further research and development on the basis of existing technologies; The price paid is to pay for the patent monopoly interests.
Patent documents can be consulted by anyone. However, if you do it within the validity period of the patent, the patentee has the right to claim compensation.