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(11)

EP 1 412 558 A1

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(43) Date of publication: 28.04.2004 Bulletin 2004/18 (21) Application number: 02712654.9 (22) Date of filing: 10.04.2002

(51) International Patent Classification (IPC)7: C25C 3/18, C25C 3/28 (86) International application number: PCT/AU2002/000457 (87) International publication number: WO 2002/083993 (24.10.2002 Gazette 2002/43)

(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: 10.04.2001 AU PR443801 (71) Applicant: BHP Billiton Innovation Pty Ltd Melbourne,Victoria 3000 (AU)	(72) Inventor: STRESOV, Les Adamstown, New South Wales 2289 (AU) (74) Representative: Jenkins, Peter David et al PAGE WHITE & FARRER54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)