(19)

(11)

EP 0 545 957 A1

(12)

(43) Date of publication: 16.06.1993 Bulletin 1993/24 (21) Application number: 91914312.0 (22) Date of filing: 26.08.1991

(51) International Patent Classification (IPC):  B22D 25/ 00( . ) C22C 1/ 10( . ) C22C 1/ 08( . ) (86) International application number: PCT/CA1991/000300 (87) International publication number: WO 1992/003582 (05.03.1992 Gazette 1992/06)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 27.08.1990 US 19900573716 11.07.1991 CA 19912046814 (71) Applicant: ALCAN INTERNATIONAL LIMITED Montreal Quebec H3A 3G2 (CA)	(72) Inventors: SANG, Harry 39 Faircrest Blvd. Kingston, Ontario K7L 4V1 (CA) JIN, Iljoon Kingston, Ontario K7M 5B1 (CA) THOMAS, Martin Kingston, Ontario K7L 4M6 (CA) KENNY, Lorne, Douglas Inverary, Ontario K0H 1X0 (CA) (74) Representative: Gaunt, Robert John, et al  Stevens, Hewlett & Perkins 1 Serjeants' Inn Fleet Street London EC4Y 1LL London EC4Y 1LL (GB)