Nouryon USA, LLC v. Xene Corporation, 1:24-cv-00613

Defendant Xene Corp. originally filed a patent infringement lawsuit against Nouryon and others in the Eastern District of New York (EDNY), involving two specific patents.
The EDNY case was dismissed due to lack of personal jurisdiction and improper venue, citing a forum selection clause in the parties' confidentiality agreement; this dismissal is now on appeal.
Nouryon then filed a declaratory judgment action in Delaware, seeking rulings of non-infringement and invalidity for the same patents.
Xene moved to dismiss the Delaware action based on lack of personal jurisdiction, improper venue, and the first-to-file rule, or alternatively to stay or transfer the case.
The Delaware court considered the overlap between the current case and the EDNY case and the effect of the pending appeal on judicial efficiency.

Issue	Plaintiff's Argument	Defendant's Argument	Held
First-to-file doctrine	Delaware case viable since EDNY case dismissed	EDNY is first-filed; Delaware case should defer	No dismissal; no active first-filed case to defer to
Stay pending EDNY appeal	Proceed now or no significant harm in a stay	Stay justified due to complete overlap, judicial efficiency	Stay granted until EDNY appeal resolves
Personal jurisdiction & venue	Delaware has jurisdiction under forum selection clause	Delaware improper under venue/jurisdiction grounds	Dismissal denied (motion denied without prejudice)
Application of forum selection	Clause applies, supporting Delaware venue	Clause does not apply	Sided with Plaintiff (agreement applies)

Crosley Corp. v. Hazeltine Corp., 122 F.2d 925 (3d Cir. 1941) (recognizes and explains the first-to-file rule to avoid duplicative litigation)
Serco Servs. Co. v. Kelley Co., 51 F.3d 1037 (Fed. Cir. 1995) (first-filed action is preferred absent exceptional circumstances)
Ethicon, Inc. v. Quigg, 842 F.2d 1422 (Fed. Cir. 1988) (trial courts' discretion to grant stays)