(19)

(11)

EP 1 713 944 A2

(12)

(88) Date of publication A3: 15.12.2005 (43) Date of publication: 25.10.2006 Bulletin 2006/43 (21) Application number: 04813718.6 (22) Date of filing: 09.12.2004

(51) International Patent Classification (IPC):  C22C 21/00(2006.01) B23P 15/26(2006.01) B22D 11/00(2006.01) F28F 21/08(2006.01) (86) International application number: PCT/US2004/041450 (87) International publication number: WO 2005/069779 (04.08.2005 Gazette 2005/31)

(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 MC NL PL PT RO SE SI SK TR (30) Priority: 12.01.2004 US 755632 (71) Applicant: Alcoa Inc. Pittsburgh, PA 15212-5858 (US)	(72) Inventor: BAUMANN, Stephen Lancaster, PA 17603 (US) (74) Representative: Parry, Simon James  Forrester & Boehmert, Pettenkoferstrasse 20-22 80336 München 80336 München (DE)