(19)

(11)

EP 1 235 944 A1

(12)

(43) Date of publication: 04.09.2002 Bulletin 2002/36 (21) Application number: 00942782.4 (22) Date of filing: 14.06.2000

(51) International Patent Classification (IPC)7: C22F 1/047 (86) International application number: PCT/US0016/204 (87) International publication number: WO 0104/0531 (07.06.2001 Gazette 2001/23)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 06.12.1999 WO PCT/IB99/02116 (71) Applicant: Pechiney Rolled Products, LLC Ravenswood, WV 26164 (US)	(72) Inventors: Smith, Kenneth Paul Mineral Wells, WV 26150 (US) Dunbar, Brady Marienville, PA 16239-0468 (US) (74) Representative: Mougeot, Jean-Claude  PECHINEY,217, cours Lafayette 69451 Lyon Cedex 06 69451 Lyon Cedex 06 (FR)