Patents are territorial. If a foreign technology has not applied for a patent in China, it does not need to obtain a license and can be used directly.
It should be noted that:
1. There is a period of time from patent application to publication. The technology may have been applied for in China but has not been made public.
2. If you are sure that you have not applied for it domestically, you can produce and sell it domestically. However, if you want to export, you must know whether the technology has applied for a patent in the country where you plan to export the product, otherwise it will be infringement. .