(19)

(11)

EP 0 891 432 A1

(12)

(43) Date of publication: 20.01.1999 Bulletin 1999/03 (21) Application number: 97906945.0 (22) Date of filing: 14.03.1997

(51) International Patent Classification (IPC):  D01B 3/ 04( . ) (86) International application number: PCT/AU1997/000169 (87) International publication number: WO 1997/034031 (18.09.1997 Gazette 1997/40)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 14.03.1996 AU 1996PN08763 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Campbell, Australian Capital Territory 2612 (AU)	(72) Inventor: ROBINSON, Gary, Alfred Anglesea, VIC 3230 (AU) (74) Representative: Kyle, Diana  Elkington and Fife Prospect House 8 Pembroke Road Sevenoaks, Kent TN13 1XR Sevenoaks, Kent TN13 1XR (GB)