Can I reapply for an expired patent?

Because China does not restrict patent application, only patent authorization, no matter what kind of invention, you can apply for a patent, even if it has been applied by others. However, in this case, the patent will generally not be authorized, because the patent applied by others has lost its novelty. Even in some cases, such as the utility model is directly authorized because it has not been retrieved, the rights are unstable, and it is easy to be invalid in the authorization process, and it is regarded as non-existent from the beginning.