Infringement of patent without knowledge can be defended; There are normal purchase channels, which can prove its legal source and do not need to bear civil liability for compensation. According to Article 11 of the Patent Law, after the patent right for invention and utility model is granted, no unit or individual may exploit the patent without the permission of the patentee, that is, it may not manufacture, use or sell its patented product or use its patented method for production and business purposes, except as provided for in Article 14 of this Law.
legal ground
Article 11 of the patent law
After the patent right for invention and utility model is granted, except as provided in Article 14 of this Law, no unit or individual may exploit its patent without the permission of the patentee, that is, it may not manufacture, use or sell its patented product or use its patented method for production and business purposes.