Judicial review of a decision on estoppel during the institution and pendency of an IPR is appropriate, because the estoppel statute applies to the duration of the action, not just the decision to institute proceedings.
Board correctly did not estop the party's claim, since there was no evidence of actual control and direction between the interested party and the litigating party, and the pre-existing relationship was not one that suggested coordinated action.
Given the plain language of the statute, the claim that the interested party was not estopped from raising was fair, as that specific claim had not arisen in the earlier action.
Substantial evidence for Board's obviousness and disclosure determinations.
(Perhaps. We don't know many things, but we especially don't know Patents. As always, entertainment value only.)