The defense of patent infringement is the defense of patent invalidation; The defense that the tort has passed the statute of limitations or the statute of limitations; And the defense of using, promising to sell or selling products that are not known to be patent infringement for production and business purposes, and can prove the legal source of the products.
Legal objectivity:
Article 166 of the General Principles of the Civil Law of People's Republic of China (PRC) * * * If the actor causes damage to the civil rights and interests of others, regardless of whether the actor is at fault or not, if the law stipulates that he should bear tort liability, such provisions shall prevail. Article 167 of the Civil Code of People's Republic of China (PRC) * * * If the infringement endangers the personal and property safety of others, the infringed party has the right to request the infringer to bear the tort liability of stopping the infringement, removing the obstruction and eliminating the danger.