ArcelorMittal Atlantique Et Lorraine v. AK Steel Corp.

Reyna, Circuit Judge.

Appellants appeal from a grant of summary judgment of non-infringement. The U.S. District Court for the District of Delaware granted summary judgment as a matter of law after concluding Appellants' infringement action was collaterally estopped. Because evidence indicates a material difference in the accused products in this action, collateral estoppel does not apply and the entry of summary judgment was error. We vacate and remand.

BACKGROUND

Plaintiff-Appellants ArcelorMittal Atlantique et Lorraine and ArcelorMittal and Plaintiff-Appellants' predecessor in interest,…