(19)

(11)

EP 1 670 958 A2

(12)

(88) Date of publication A3: 13.04.2006 (43) Date of publication: 21.06.2006 Bulletin 2006/25 (21) Application number: 04769713.1 (22) Date of filing: 30.09.2004

(51) International Patent Classification (IPC):  C21B 13/14(1968.09) C21B 13/00(1968.09) C21B 13/02(1968.09) (86) International application number: PCT/IB2004/003483 (87) International publication number: WO 2005/031009 (07.04.2005 Gazette 2005/14)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR Designated Extension States: AL HR LT LV MK (30) Priority: 30.09.2003 US 507160 P 29.09.2004 US 953735 (71) Applicant: HYLSA, S.A. de C.V. Nuevo Leon (MX)	(72) Inventors: VIRAMONTES-BROWN, Ricardo Mirador de la Sierra 347 Nuevo Leon 66256 (MX) VILLARREAL-TREVINO, Juan A. Guadalupe, Nuevo Leon67174 (MX) LOPEZ-GOMEZ, Ronald V. M. Mario Talavera224 Nuevo Leon 66450 (MX) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)