The US Court of Appeals for the Federal Circuit revived key portions of a long-running patent dispute, rejecting the district court’s extraterritoriality ruling and narrowing its prosecution disclaimer analysis while leaving intact the exclusion of certain damages theories for inadequate disclosure. VLSI Technology LLC v. Intel Corporation, Case No. 24-1772 (Fed. Cir. Apr. 15, 2026) (Moore, Chen, Kleeh, JJ.)

VLSI filed suit in 2017 accusing Intel of infringing several patents related to selecting an appropriate core in a multicore processor to execute a task based on measured performance characteristics. Following claim construction and discovery, the district court struck portions of VLSI’s damages case, concluding that certain theories advanced by VLSI’s damages expert had not been adequately disclosed. The court then granted summary judgment of noninfringement on two independent grounds: extraterritoriality on the theory that the claimed “measuring” activity occurred outside the United States, and failure of VLSI’s doctrine of equivalents arguments. VLSI appealed.

The Federal Circuit reversed in substantial part. As to the asserted method claims, the Federal Circuit concluded that the district court’s extraterritoriality analysis could not be reconciled with the parties’ stipulation. That stipulation provided that, for accused Intel products and activities meeting the technical requirements of the asserted claims, 70% would be deemed to satisfy the requisite US nexus for infringement purposes. The district court had reasoned that the stipulation could not establish domestic infringement unless the underlying claim limitations themselves were practiced in the United States. The Federal Circuit disagreed, emphasizing the stipulation’s plain language that the technical requirement inquiry was to be conducted “without regard to geographic considerations.”

The Federal Circuit rejected Intel’s contention that the stipulation merely served as a damages accounting shortcut rather than as an agreement bearing on infringement. However, in the Court’s view, stipulating a fact relevant to infringement, such as US nexus, is different from conceding infringement itself. The Court therefore found that Intel was bound by the agreement it struck, even if it later came to view the agreement as “imprudently made.”

On that basis, the Federal Circuit reversed the grant of summary judgment of noninfringement on extraterritoriality grounds for the asserted method claims.

The Federal Circuit also reversed summary judgment as to the asserted apparatus claims. It concluded that the district court had focused too narrowly on where the claimed measuring functionality was practiced, rather than on whether the accused products were reasonably capable of performing the claimed functions without significant alteration. The Court concluded that the record contained sufficient evidence to create a genuine dispute of material fact as to whether the accused products were reasonably capable of performing the claimed measuring limitations. Summary judgment was therefore inappropriate, and the Court reversed the extraterritoriality ruling as to the apparatus claims.

The Federal Circuit also reinstated VLSI’s doctrine of equivalents theory for some of the apparatus claims that the district court had barred based on a prosecution disclaimer finding. Referencing the prosecution of the asserted patent, the district court imported an “upon identifying” limitation into the claims, notwithstanding [...]

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