An inter partes review (IPR) petitioner appeals the final written decision of the Patent Trial and Appeal Board (PTAB) as to claims upheld but is found to have no standing, as there is no present indication that the challenger would face a patent infringement suit in future. Under these circumstances, would the IPR statutory estoppel provision, 35 U.S.C. § 315(e), prevent the petitioner from asserting the challenges it brought against the upheld claims if the patent owner were to assert those claims against the petitioner in future? Note that under these circumstances, if estopped, the petitioner would have sought judicial review, but the merits of the challenges would not have been reviewed by an Article III court. This was one of the questions before the Federal Circuit in Avx Corporation v. Presidio Components, Inc. 2018-1106 (Fed. Cir. May 13, 2019) (“Avx Corp.”). Although the court declined to answer the question, as there were no adversarial presentations on this question, it clarified that the operation of estoppel was not a foregone conclusion under these facts, which, the court indicated, may fall under one of the exceptions to issue preclusion.

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