(19)

(11)

EP 1 789 221 A1

(12)

(43) Date of publication: 30.05.2007 Bulletin 2007/22 (21) Application number: 05778814.3 (22) Date of filing: 30.08.2005

(51) International Patent Classification (IPC):  B22D 41/22(2006.01) B22D 41/02(2006.01) B22D 43/00(2006.01) C22C 1/00(2006.01) B22D 41/005(2006.01) (86) International application number: PCT/CA2005/001310 (87) International publication number: WO 2006/024148 (09.03.2006 Gazette 2006/10)

(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 NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK YU (30) Priority: 30.08.2004 US 605586 P (71) Applicant: ALCAN INTERNATIONAL LIMITED Montreal Quebec H3A 3G2 (CA)	(72) Inventors: LANGLAIS, Joseph Jonquière, Québec G7X 4G5 (CA) COT , Pascal Chicoutimi, Québec G7H 7Z6 (CA) PELLETIER, Roger Jonquière, Québec G7S 4N9 (CA) DOUTRE, Don Allen Kingston, Ontario K7P 2H6 (CA) (74) Representative: Perkins, Sarah et al Stevens, Hewlett & Perkins Halton House 20/23 Holborn London EC1N 2JD London EC1N 2JD (GB)