(19)

(11)

EP 0 642 468 A1

(12)

(43) Date of publication: 15.03.1995 Bulletin 1995/11 (21) Application number: 93909675.0 (22) Date of filing: 17.05.1993

(51) International Patent Classification (IPC):  B01J 23/ 00( . ) C01B 13/ 18( . ) C01F 7/ 00( . ) C01F 7/ 16( . ) C01G 25/ 00( . ) C01G 53/ 00( . ) B01J 37/ 08( . ) C01F 5/ 00( . ) C01F 7/ 02( . ) C01F 17/ 00( . ) C01G 25/ 02( . ) (86) International application number: PCT/AU1993/000226 (87) International publication number: WO 1993/024411 (09.12.1993 Gazette 1993/29)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 27.05.1992 AU 1992PL02626 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Campbell, Australian Capital Territory 2601 (AU)	(72) Inventors: TURNEY, Terence, William Mount Waverley, VIC 3149 (AU) FOGER, Karl Kew, VIC 3101 (AU) HOANG, Manh South Clayton, VIC 3169 (AU) (74) Representative: Perry, Robert Edward  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)