What about the defendant's patent infringement?

What should we do when an enterprise is accused of patent infringement? First of all, we should entrust a professional intellectual property lawyer to judge whether our products belong to the scope of patent protection. Secondly, if the product really belongs to the scope of patent protection, then it is necessary to judge whether the patent right is stable. If we think that the patent does not have the conditions to authorize the patent right after retrieval and analysis, we can declare it invalid to the Patent Office. Finally, if the patent right is stable, the product belongs to the scope of protection, and the defendant has no subjective intention of infringement, he should provide evidence such as legal source and prior use to prove that he has no subjective intention. Article 70 of the Patent Law: Anyone who uses, promises to sell or sells an infringing patented product for the purpose of production and operation without knowing that the product was manufactured or sold without the permission of the patentee shall not be liable for compensation.