The Federal Circuit’s Collateral Estoppel Morass

by Dennis Crouch

The Federal Circuit has denied en banc rehearing in Kroy IP Holdings, LLC v. Groupon, Inc., leaving in place a February 2025 panel decision that significantly limits the collateral estoppel effect of Patent Trial and Appeal Board (PTAB) unpatentability determinations. The denial includes contrasting from Chief Judge Moore and Judge Dyk. [23-1359.ORDER.8-1-2025_2553055]