(19)

(11)

EP 1 324 950 A1

(12)

(43) Date of publication: 09.07.2003 Bulletin 2003/28 (21) Application number: 01961449.4 (22) Date of filing: 17.07.2001

(51) International Patent Classification (IPC)7: C01G 23/053 (86) International application number: PCT/NZ0100/144 (87) International publication number: WO 0200/6159 (24.01.2002 Gazette 2002/04)

(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: 17.07.2000 NZ 50577400 (71) Applicant: Industrial Research Limited Lower Hutt (NZ)	(72) Inventors: AL-SALIM, Najeh, Ibrahim Lower Hutt (NZ) KEMMITT, Timothy Epuni,Lower Hutt (NZ) (74) Representative: Setna, Rohan P. et al Boult Wade TennantVerulam Gardens70 Gray's Inn Road London WC1X 8BT London WC1X 8BT (GB)