This issue of The PTAB Review begins by examining a recent Federal Circuit decision that expands the scope of inter partes review (IPR) estoppel to encompass printed publication prior art the petitioner knew about when filing a first petition, even when the PTAB and the parties decided to exclude those references from the instituted IPR. Next, we examine another recent Federal Circuit decision that confirms that applicant-admitted prior art (AAPA) cannot itself form the basis for an IPR ground in lieu of printed publication prior art. Finally, we conclude by discussing Judge Leonard Stark, who will become the newest Federal Circuit judge later this month.