(19)

(11)

EP 1 711 694 A1

(12)

(43) Date of publication: 18.10.2006 Bulletin 2006/42 (21) Application number: 03768117.8 (22) Date of filing: 21.11.2003

(51) International Patent Classification (IPC):  F01N 1/24(2006.01) (86) International application number: PCT/IT2003/000763 (87) International publication number: WO 2005/049982 (02.06.2005 Gazette 2005/22)

(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 PT RO SE SI SK TR Designated Extension States: AL LT LV (71) Applicant: Vale S.R.L. 81030 Lusciano (IT)	(72) Inventor: PIANESE, Luigi I-81030 Lusciano (IT) (74) Representative: Fiammenghi, Carlo et al Fiammenghi Fiammenghi Via Quattro Fontane, 31 00184 Roma 00184 Roma (IT)