When will Hou Xiankun's patent come down?

About 45 days. Hou Xiankun, founded on 20 15, located in Heze City, Shandong Province, is a retail-oriented enterprise. Hou Xiankun's patent will come down in about 45 days. Patent, literally, refers to the exclusive right. The word "patent" comes from Latin "Litterae patentes", which means open letters or open documents. It is a certificate used by medieval monarchs to issue certain privileges, and later refers to the exclusive right certificate signed by the British king himself.