IGT v. Aristocrat Technologies, Inc., No. 15-2083 (Fed. Cir. May 12, 2016)

From the Opinion

The passage below is extracted verbatim from the opening of the document. It has not been editorially summarized — consult the full opinion for the court's complete reasoning.

IGT appeals the district court’s denial of its motion for a preliminary injunction to prohibit Aristocrat from challenging the validity of IGT’s patents at the U.S. Patent and Trademark Office (“ PTO”). IGT argues that the doctrine of assi gnor estoppel precludes invalidity challenges by Aristocrat, and that IGT would suffer irreparable harm if Aristocrat were to file a petition for inter partes review and succeed in cancelling IGT’s patent claims. The district court denied IGT’s motion. I GT v. Aristocrat Techs., Inc., No. 2:15 -cv-473 (D. Nev. Sep t.