Patents applied in China are only protected by law in China. Because:
patents are regional. The so-called regionality is the spatial restriction of patent right. It means that the patent granted and protected by a country or region is only valid within the scope of that country or region, and has no legal effect on other countries and regions, and its patent right is not confirmed and protected. If the patentee wishes to enjoy the patent right in other countries, he must file another patent application in accordance with the laws of other countries. No country will recognize the patent rights granted by other countries or international intellectual property institutions unless it has acceded to international treaties and bilateral agreements.
—— Source: China National Intellectual Property Administration.