(19)

(11)

EP 1 509 731 A1

(12)

(43) Date of publication: 02.03.2005 Bulletin 2005/09 (21) Application number: 03733616.1 (22) Date of filing: 19.05.2003

(51) International Patent Classification (IPC)7: F24J 2/52 (86) International application number: PCT/NL2003/000369 (87) International publication number: WO 2003/098126 (27.11.2003 Gazette 2003/48)

(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 MK (30) Priority: 17.05.2002 NL 1020620 (71) Applicant: ALCOA NEDERLAND B.V. 5150 BA Drunen (NL)	(72) Inventor: SCHAUFELI, Alain, Ferdinand NL-4001 RV Tiel (NL) (74) Representative: van Westenbrugge, Andries  Nederlandsch OctrooibureauPostbus 29720 2502 LS Den Haag 2502 LS Den Haag (NL)