Chinese laws
If you want to apply for a patent abroad for innovative technologies produced in mainland China, you need to submit a confidentiality review to the State Intellectual Property Office first. If there is no problem with the review, you can apply for it. Apply for a patent abroad; if you directly apply for a patent abroad without review, the technology cannot be patented in the mainland, and the country no longer protects the domestic patent rights of the technology
Since patents have strict time limits order, so the common practice is to first apply for a patent domestically, and then file a PCT application at the same time or within a certain period of time, and designate the relevant country as the patent application country