What circumstances constitute patent infringement?

Legal analysis: First, manufacturing, using, promising to sell, selling or importing its patented products for production and operation purposes without the permission of the patentee, or using its patented method and using, promising to sell, selling or importing products directly obtained according to the patented method. Second, manufacturing, promising to sell, selling or importing its patented products for the purpose of production and operation without the permission of the patentee.

Legal basis: People's Republic of China (PRC) Patent Law.

Article 11 After the patent right for invention and utility model is granted, except as otherwise provided in this Law, no unit or individual may exploit the patent without the permission of the patentee, that is, it may not manufacture, use, promise to sell, sell or import the patented product for production and business purposes, nor may it use the patented method and use, promise to sell, sell or import the product directly obtained according to the patented method.

After the design patent is granted, no unit or individual may exploit its patent without the permission of the patentee, that is, it may not manufacture, promise to sell, sell or import its patented product for production and business purposes.