USA: ArcelorMittal France v. AK Steel Corp, United States Court of Appeals, Federal Circuit, No. 2014-1191, 12 May 2015
In light of a binding prior Federal Circuit decision narrowly construing a key claim term in a patent relating to type of mechanically-resistant steel sheet, the federal district court in Wilmington, Delaware, properly invalidated the first 23 claims of a reissue patent as impermissibly broader than the original claims, but the court erred in invalidating…