(19)

(11)

EP 0 808 377 A1

(12)

(43) Date of publication: 26.11.1997 Bulletin 1997/48 (21) Application number: 96901641.0 (22) Date of filing: 09.02.1996

(51) International Patent Classification (IPC):  C22B 3/ 16( . ) C22B 34/ 12( . ) (86) International application number: PCT/AU1996/000059 (87) International publication number: WO 1996/024699 (15.08.1996 Gazette 1996/37)

(84) Designated Contracting States: DE ES FR GB IT NL (30) Priority: 10.02.1995 AU 1995PN01051 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Campbell, ACT 2601 (AU)	(72) Inventors: FLETCHER, Stephen Melbourne, VIC 3004 (AU) HORNE, Michael, David Northcote, VIC 3070 (AU) (74) Representative: Woods, Geoffrey Corlett  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)