Addressing for the first time whether an invalidity order merges with a voluntary dismissal for purposes of finality, the US Court of Appeals for the Federal Circuit held that an interlocutory order merges with the final dismissal, rendering the interlocutory order final for purposes of issue preclusion. Koss Corp. v. Bose Corp., Case No. 22-2090 (Fed. Cir. July 19, 2024) (Hughes, Stoll, Cunningham, JJ.). As a consequence, the Federal Circuit found that the patent owner’s appeal from an adverse decision in an inter partes review (IPR) was moot under the doctrine of nonmutual collateral estoppel.

In July 2020, Koss filed a patent infringement lawsuit against Bose in the Western District of Texas, asserting three patents whose common specification discloses a “wireless earphone that communicates with a digital-audio source, such as an iPod, over an ad hoc wireless network like Bluetooth.” The same day, Koss asserted the same patents against Plantronics. Bose filed a motion challenging venue and also petitioned for inter partes review (IPR) of the three patents. Later in 2020, Bose filed a declaratory judgment action seeking a declaration of noninfringement in the District of Massachusetts on the three patents Koss asserted against Bose in the Texas litigation. The Massachusetts litigation was stayed pending the resolution of the venue motions in the Texas case.

In 2021, the Texas court dismissed Koss’s complaint against Bose for improper venue. Koss then asserted a counterclaim of infringement of the same three patents in the Massachusetts litigation. The Massachusetts court again stayed the litigation pending the resolution of the IPRs, which (by that time) the Patent Trial & Appeal Board had instituted. Meanwhile, Koss’s case against Plantronics was transferred to the Northern District of California, and Plantronics moved to dismiss the complaint on the ground that all the asserted claims (which included all the claims asserted against Bose) were invalid under 35 U.S.C. § 101. The California court granted Plantronics’s motion, rendering all the asserted claims invalid. However, that order did not finally dispose of the case.

Koss then moved for leave to amend its complaint, which the California district court granted. In the amended complaint, Koss asserted two additional patents. Plantronics moved to dismiss the asserted claims in those patents as invalid under § 101. The parties fully briefed Plantronics’s motion, but before the district court issued a decision on the merits of that motion, Koss voluntarily stipulated to dismissal with prejudice, disposing of the lawsuit in its entirety. Koss did not ask the district court to vacate its earlier order finding certain claims invalid under § 101. The California district court then issued an order dismissing the case with prejudice. The deadline for Koss to appeal the judgment came and went – Koss did not appeal.

Arguing that the patents had been finally adjudicated invalid in the Plantronics litigation, Bose moved to dismiss Koss’s appeal from the Board in the IPR proceedings as moot. Koss opposed the motion, arguing that its amended complaint rendered the invalidity decision on the prior complaint non-final because the [...]

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