Collateral Estoppel Requires Same Grounds, Says PTAB

Collateral Estoppel Requires Same Grounds, Says PTAB

By Albert Liou The PTAB’s recent decision in TicketNetwork, Inc. v. CEATS, Inc. reminds litigants that collateral estoppel only applies when there is an identity of issues.  In the decision, the PTAB refused to find that a claim limitation was disclosed by a prior art...