Legal analysis: The patent right has a fixed term of protection, and the patent right will be terminated after its expiration. The term of the invention patent right is 2 years, and the term of the utility model patent right and the design patent right is 1 years, both counting from the date of application. Therefore, the patent protection period expires, that is, the patent right terminates. If the patent right terminates, it can't be applied again, because the expired patent belongs to the published technology, and the patent has lost its novelty. Unless the original technology is improved, it can be applied again.
Legal basis: Article 1 of Announcement No.8 of China National Intellectual Property Administration, for the invention patent right that was filed with the former China Patent Office before December 31, 1992 (including that day) and is still valid until December 11, 21, the patent term is extended to 2 years from the date of application.