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Intellectual Property Litigation Patent Litigation

IPR Estoppel: The Present and the Future

IPRs have now been conducted for several years, and litigation has ensued over the procedures by which they are conducted. Decisions have been rendered by the U.S. Supreme Court and the U.S. Court of Appeals for the Federal Circuit, which have resolved some issues, created others, and altered procedures.


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The America Invents Act (AIA) created inter partes review (IPR) to allow the public to challenge issued patents based upon published prior art. IPRs allowed for greater participation for challengers, and replaced the previous inter partes reexamination procedure. IPRs are conducted before a panel of Administrative Patent Judges of the Patent Trial and Appeal Board (PTAB). In contrast, inter partes reexamination was conducted before a patent examiner, and permitted appeal to the PTAB.

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