How can a product be infringed if it has a patent?

Product patent infringement should meet the following conditions: the constitutive elements of patent infringement include formal conditions and substantive conditions. First, the form requirement (1) relates to a valid China patent; (2) The implementation must be carried out without the permission or authorization of the patentee; (3) the implementation behavior must be for the purpose of production and operation. Second, the substantive elements constitute the substantive elements of patent infringement, that is, technical conditions, and whether the substantive implementation behavior belongs to the scope of patent protection. If the technical features involved by the actor belong to the scope of patent protection, then the actor constitutes patent infringement. Article 11 People's Republic of China (PRC) Patent Law Article 60 People's Republic of China (PRC) Patent Law Article 61 People's Republic of China (PRC) Patent Law Article 65