The U.S. Court of Appeals for the Federal Circuit recently delved into the application of collateral estoppel in the Kroy v. Groupon case. The key question addressed was whether a ruling of invalidity by the U.S. Patent and Trademark Office’s Patent Trial and Appeal Board (PTAB) during an inter partes review could prevent a patent holder from suing for infringement on different claims of the same patent in district court. The Federal Circuit reversed the lower court’s decision, affirming that a previous finding of invalidity at the PTAB cannot preclude a district court lawsuit regarding different claims of the same patent.
For further insights on this decision and its implications for patent strategy, particularly in the arena of collateral estoppel, please visit the original article on Law.com via the link.