(19)

(11)

EP 0 539 417 A1

(12)

(43) Date of publication: 05.05.1993 Bulletin 1993/18 (21) Application number: 91912577.0 (22) Date of filing: 12.07.1991

(51) International Patent Classification (IPC):  B22D 27/ 20( . ) C22C 32/ 00( . ) C22C 1/ 10( . ) (86) International application number: PCT/CA1991/000242 (87) International publication number: WO 1992/001821 (06.02.1992 Gazette 1992/04)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 16.08.1990 US 19900572218 26.07.1990 US 19900558630 (60) Divisional application: 95108612.3 / 0671478 (71) Applicant: ALCAN INTERNATIONAL LIMITED Montreal Quebec H3A 3G2 (CA)	(72) Inventors: SKIBO, Michael, D. Leucadia, CA 92024 (US) HAMMOND, Donald, E. San Diego, CA 92127 (US) (74) Representative: Gaunt, Robert John, et al  Stevens, Hewlett & Perkins 1 Serjeants' Inn Fleet Street London EC4Y 1LL London EC4Y 1LL (GB)