What is the procedure for invalidation of patent right?

In order to correct the wrong authorization that China National Intellectual Property Administration may make, the Patent Law stipulates the procedure of invalidation. From the date when the Patent Office announces the authorization, if any unit or individual thinks that the grant of the patent right is not in conformity with the relevant provisions of the Patent Law, it may request the Patent Reexamination Board to declare the patent right invalid or partially invalid. An invalid patent right shall be deemed to have ceased to exist as of the date of application.