Yes, after the appearance patent expires, the patentee can still protect the rights, but the requirements are higher than the ordinary rights protection standards. First of all, before the patent expires, the patentee must make a clear statement nationwide, indicating that he owns the patent right and pointing out the way to deal with any infringement; Secondly, the patentee must be able to prove that he has been actively defending his patent right during and after the patent validity period; Finally, the patentee must be able to prove that the infringed party began to infringe his patent right after the patent was valid. "
Legal objectivity:
Article 45 of the Patent Law of People's Republic of China (PRC) stipulates that the term of invention patent is 20 years, and the term of utility model patent and design patent is 10 years, all of which are counted from the date of filing. This article explains that patent right is different from movable property and immovable property.