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ArcelorMittal sues AK Steel over cold rolled patent
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Wednesday, 17 Apr 2013
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ArcelorMittal USA LLC, part of the world’s biggest steelmaker, sued a unit of AK Steel Holding Corp for infringing a patent for automotive quality cold rolled sheet steel.

The US arm of Luxembourg based ArcelorMittal contends West Chester, Ohio based AK is wrongly using the high tensile strength aluminum boron technology for stamped auto parts, according to a complaint filed in federal court in Wilmington, Delaware.

“ArcelorMittal has been damaged by such infringement and will continue to be damaged by such infringement,” unless it’s stopped by a court, according to the complaint, which seeks a jury trial, damages and court costs.

In a similar case filed in 2010, a judge in the same court ruled that the patent was invalid and not infringed. An appeals court last year sent the case back for review. Meanwhile, the owner made changes to the old patent, had it reissued with a different number and is using it in this case.

The new case is ArcelorMittal v AK Steel, US District Court, District of Delaware (Wilmington). The old case is ArcelorMittal v AK Steel, 10-cv-00050, US District Court, District of Delaware (Wilmington).

Source - Bloomberg


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