Under what circumstances is a patent not regarded as infringement of a patent right?

1. After the patented product manufactured by the patentee or manufactured with the permission of the patentee is sold, the patentee's permission is no longer needed to use or sell the product. 2. The use of the first user. Paragraph 3 of Article 62 of the Patent Law stipulates that the same product has been manufactured by the same method before the filing date, or it has been manufactured, used or prepared, and continues to be manufactured and used only within the original scope, which is not regarded as infringement. This is the principle of preemptive strike. 3. Use or sell in good faith patented products that are manufactured and sold without the permission of the patentee. Paragraph 2 of Article 62 of China's Patent Law stipulates that the use or sale of patented products that are not known to be manufactured or sold without the permission of the patentee shall not be regarded as infringement. 4. Use patented products in the operation of foreign means of transport. Paragraph 4 of Article 62 of China's Patent Law stipulates that foreign means of transport that temporarily pass through China's territory, territorial sea and airspace use relevant patents in their devices and equipment for their own use according to agreements signed with China or international treaties to which they are both parties, or according to the principle of reciprocity, which is not regarded as infringement. 5. For non-commercial purposes. Article 62 of the Patent Law stipulates that the act of using the relevant patent exclusively for scientific research and experiment is not regarded as infringement, because it is not a commercial act.