Appeals court sends patent ruling back for further review

Dec 03, 2012 | 05:44 PM | Chris Prentice

Tags  boron steel sheet, hot-rolled sheet, cold-rolled sheet, ArcelorMittal, AK Steel, Severstal Dearborn, Wheeling-Nisshin, U.S. Court of Appeals Chris Prentice

NEW YORK — A judgment in a patent lawsuit filed by ArcelorMittal SA’s French units against AK Steel Corp., Severstal Dearborn Inc. and Wheeling-Nisshin Inc. has been sent back to U.S. District Court in Delaware for further review.

The U.S. Court of Appeals said a jury verdict that a U.S. patent for boron steel sheet with an aluminum-based coating held by ArcelorMittal France and ArcelorMittal Atlantique et Lorraine had not been infringed upon by the other steelmakers was based on an incorrect definition of the product.....

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