A post-grant review (PGR) petition can challenge the validity of a patent that contains at least one claim with priority after March 16, 2013, the date the America Invents Act (AIA) went into effect (AIA claims).
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8 January 2015 The first-ever post-grant review proceeding at the US Patent and Trademark Office, centring on a patent covering the Rainbow Loom bracelet, has been terminated after the parties settled the dispute.
12 August 2014 A US toy manufacturer has teamed up with multinational chain Toys R Us to file the first Post-Grant Review petition to challenge a patent related to the popular Rainbow Loom craze.