Is it okay if the core technology is not patented?

Patents that have not been applied in China are not protected in China, and imitation production in China is not infringing. If it is a patented technology, you can get its technology by querying the patent. If it's not in the patent, it's a technical secret, and I'm afraid it's hard to get it from other sources. If it is a product patent, it can be obtained through disassembly analysis.