The product is patented, and if the patent is exploited without the permission of the invention patentee, it is regarded as infringement. The limitation of action for patent infringement is three years, counting from the date when the patentee or interested party knows or should know about the infringement and infringer.
Legal objectivity:
Article 75 of the Patent Law shall not be regarded as infringement of the patent right under any of the following circumstances: (1) The patentee or a unit or individual authorized by him uses, promises to sell, sells or imports a patented product or a product directly obtained by a patented method. Article 77 Anyone who, for the purpose of production and operation, uses, promises to sell or sells an infringing patented product that he does not know was manufactured and sold without the permission of the patentee shall not be liable for compensation if he can prove the legal source of the product.