What are the procedures for purchasing foreign patents? Which departments should I go to for the record? What is the specific process?

Patents are regional, and foreign patents are only protected in the country where the patent is applied. Unless the patent is also applied in China, it is also protected in China. As for the formalities, only the buyer and the seller sign the authorization or transfer contract. If the transfer needs to be filed with the National Information Bureau, it means that the patent has been transferred to another person.