issue preclusion

How Is Collateral Estoppel Applied to Patent Invalidity?

A California court has held that a defendant is collaterally estopped from asserting patent-ineligibility under 35 USC § 101 because the defendant, in prior litigation, lost a post-trial motion in which it evidently raised other… Read More

CAFC: Alice Not a Change in Law Preventing Issue Preclusion

A Federal Circuit panel (Judges Lourie, Newman, and Reyna) has rejected a district court’s statement that Alice Corp. v. CLS Bank Int’l., was “an intervening change in the law” that would “exempt a potential applicat… Read More

Alice Changed Law, No Issue Preclusion on Patent-Eligibility

Where a patent had survived a challenge under 35 U.S.C. § 101 in prior litigation between the parties, issue preclusion did not prevent a court from revisiting the question, and invalidating the patent claims, because, the court… Read More