An inter partes review (IPR) is a procedure to challenge a patent in the U.S. Patent and Trademark Office (PTO). The IPR procedure was established by the American Invents Act, and was intended to be an improvement on the existing inter partes reexamination procedure. An IPR is brought before the PTO’s Patent Trial and Appeal Board (PTAB), which handles the proceeding and decides the outcome.
Any person can file a petition requesting an IPR of an issued patent. The petition must show that at least one claim of the patent is unpatentable on the grounds of anticipation (35 U.S.C. §102) or obviousness (35 U.S.C. §103). The petitioner must prove unpatentability by a preponderance of the evidence. The PTO decides whether to grant the petition.
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