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(11)

EP 0 641 255 A1

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(43) Date of publication: 08.03.1995 Bulletin 1995/10 (21) Application number: 92923495.0 (22) Date of filing: 13.11.1992

(51) International Patent Classification (IPC):  B01J 23/ 755( . ) C10L 1/ 02( . ) B01J 23/ 76( . ) (86) International application number: PCT/AU1992/000613 (87) International publication number: WO 1993/009870 (27.05.1993 Gazette 1993/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL SE (30) Priority: 15.11.1991 AU 19910000094 (71) Applicant: THE BROKEN HILL PROPRIETARY COMPANY LIMITED Melbourne, VIC 3000 (AU)	(72) Inventor: PERCIVAL, Gordon Hughesdale, VIC 3166 (AU) (74) Representative: Jenkins, Peter David, et al  PAGE WHITE & FARRER 54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)