(Corrects name of AK Steel in headline.)
ArcelorMittal (MT) won a revival of its patent-infringement case against AK Steel Corp. over a process to make steel stronger so it can be used in automobile manufacturing.
A trial judge erred in her interpretation of what an ArcelorMittal patent covered, the U.S. Court of Appeals for the Federal Circuit today said in an opinion posted on its website. The Federal Circuit said the judge should consider whether the patent was valid and infringed. It said she could consider ruling on the issue without need for a new trial.
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