What does it mean to declare the patent invalid?

Invalidation of the invention patent right refers to the system that any unit or individual can request the reexamination board to declare it invalid according to law if the grant of the patent right does not conform to the provisions of the patent law from the date of obtaining the patent right. The patent right that has been declared invalid shall be regarded as nonexistent from the beginning, and the decision to declare the patent right invalid shall be registered and announced by the patent administration department of the State Council.

legal ground

Article 45 of the Patent Law: Since the date when the patent administration department in the State Council announced the grant of the patent right, any unit or individual may request the patent administration department in the State Council to declare the patent right invalid if it considers that the grant of the patent right is not in conformity with the relevant provisions of this Law. Article 46 The patent administration department in the State Council shall promptly examine the request for invalidation of the patent right and make a decision, and notify the claimant and the patentee. The decision to declare the patent right invalid shall be registered and announced by the patent administration department of the State Council. Anyone who refuses to accept the decision of the State Council Patent Administration Department to declare the patent right invalid or maintain the patent right may bring a lawsuit to the people's court within three months from the date of receiving the notice. The people's court shall notify the other party to the procedure for requesting invalidation to participate in the proceedings as a third party.