The court1 may revoke a patent on the application of any person2 on, but only on, any of the following grounds3:
(1) that the invention is not a patentable invention4;
(2) that the patent was granted to a person who was not entitled5 to be granted that patent6;
(3) that the specification7 does not disclose the invention clearly and completely enough for it to be performed by a person skilled in the art8;
(4) that the matter disclosed in the specification extends beyond that disclosed in the application for the patent, as filed9, or, if the patent was granted
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