Anyone who uses, promises to sell or sells a product that infringes the patent right for the purpose of production and operation, and does not know that the product is manufactured or sold without the permission of the patentee, shall not be liable for compensation.
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.