On August 16, 2018, the U.S. Federal Circuit addressed when the inter partes review (IPR) time bar clock begins to tick. See Click-to-Call Tech. LP v. Ingenio, Inc., Slip Op. 2015-1242 (Fed. Cir. Aug. 16, 2018). The en banc Federal Circuit addressed whether the one year estoppel clock begins for a properly served complaint when the complaint is subsequently dismissed without prejudice. The panel found that the § 315(b) time bar applies. The filing of such a complaint, though later voluntarily dismissed, has previously formed the basis for declaratory judgment jurisdiction where the initial defendant later brings a validity challenge. See TransWeb, LLC v. 3M Innovative Props. Co., 812 F.3d 1295, 1300 (Fed. Cir. 2016).