(19)

(11)

EP 2 593 745 A1

(12)

(43) Date of publication: 22.05.2013 Bulletin 2013/21 (21) Application number: 11744136.0 (22) Date of filing: 14.07.2011

(51) International Patent Classification (IPC):  F42B 5/28(2006.01) (86) International application number: PCT/US2011/043995 (87) International publication number: WO 2012/009527 (19.01.2012 Gazette 2012/03)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 14.07.2010 US 364263 P (71) Applicant: Ak Steel Properties, Inc. West Chester, OH 45069 (US)	(72) Inventors: SCHERRER, Daniel, Keith Monroe OH 45050 (US) DOUTHETT, Joseph, Alan Monroe OH 45050 (US) (74) Representative: Samson & Partner  Widenmayerstrasse 5 80538 München 80538 München (DE)