Under the Board's rules, a patent owner gets to have the last word in a PTAB proceeding by filing a sur-reply to the petitioner's reply. Sur-replies may only respond to arguments raised in the reply, and the "sur-reply . may not be accompanied by new evidence other than deposition transcripts of the cross-examination of any reply witness." 37 C.F.R. § 42.23(b). Recent decisions by PTAB panels have clarified the conditions under which a patent owner may submit exhibits that were introduced at deposition with a sur-reply.
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