A patent invalidation application refers to an application for patent invalidation based on the provisions of Article 45 of the Patent Law: From the date when the Patent Office announces the grant of a patent right, any unit or individual believes that the grant of the patent right does not comply with the relevant provisions of this Law. You can request the Patent Reexamination Board to declare the patent invalid. This is to maintain the seriousness of the patent law and safeguard the interests of the general public. The patent law has set up a "patent invalidation procedure" in the patent examination procedure.