1. The product you sell is sold by the patentee or its licensing unit, which belongs to exhaustion, but you are not an infringement.
2. If the same product has been manufactured before the patent application date, the same method has been used or necessary preparations have been made for its manufacture and use, and it is not infringing if it continues to be manufactured and used only within the original scope.
3. For the purpose of production and operation, anyone who uses, promises to sell or sells an infringing patented product without knowing that it was manufactured and sold without the permission of the patentee, and can prove the legal source of the product, shall not be liable for compensation. If you belong to this situation, you are infringing, but you don't have to pay compensation.