ArcelorMittal Patent Declared Invalid in Infringement Suit with AK Steel
A Delaware judge invalidated a patent by ArcelorMittal in a ruling favoring AK Steel in a dispute that has been ongoing for almost six years. The original suit, filed in January 2010 by ArcelorMittal, claimed that AK Steel’s lightweight, high-strength steel Ultralume, used in automotive applications, violated ArcelorMittal’s 2001 patent (patent 6,296,805—referred to as ‘805) […]

