(19)

(11)

EP 1 287 175 A1

(12)

(43) Date of publication: 05.03.2003 Bulletin 2003/10 (21) Application number: 01940521.6 (22) Date of filing: 21.05.2001

(51) International Patent Classification (IPC)7: C22C 21/00, C22C 21/10, F28F 21/08 (86) International application number: PCT/EP0105/920 (87) International publication number: WO 0109/0430 (29.11.2001 Gazette 2001/48)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 22.05.2000 EP 00201808 (71) Applicant: Norsk Hydro Technology B.V. 4540 HS Sluiskil (NL)	(72) Inventors: AURAN, Lars N-6600 Sunndalsora (NO) FURU, Trond N-6600 Sunndalsora (NO) DAALAND, Ole N-5500 Haugesund (NO) (74) Representative: Bleukx, Lucas Lodewijk M.  Hydro S.A.Avenue Marcel Thiry 83 1200 Bruxelles 1200 Bruxelles (BE)