(19)

(11)

EP 2 057 295 A2

(12)

(88) Date of publication A3: 15.05.2008 (43) Date of publication: 13.05.2009 Bulletin 2009/20 (21) Application number: 07799599.1 (22) Date of filing: 14.07.2007

(51) International Patent Classification (IPC):  C21D 9/573(2006.01) B21C 1/02(2006.01) C21D 1/63(2006.01) (86) International application number: PCT/US2007/073549 (87) International publication number: WO 2008/009009 (17.01.2008 Gazette 2008/03)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR (30) Priority: 14.07.2006 US 487044 (71) Applicant: Thermcraft, Inc. Winston-salem, NC 27117 (US)	(72) Inventor: TYL, Thomas, W. Siler City, NC 27344 (US) (74) Representative: Rössler, Matthias  KNH Patentanwälte Kahlhöfer Neumann Herzog Fiesser Postfach 10 33 63 40024 Düsseldorf 40024 Düsseldorf (DE)