(19)

(11)

EP 0 205 496 A1

(12)

(43) Date of publication: 30.12.1986 Bulletin 1986/52 (21) Application number: 86900031.0 (22) Date of filing: 20.12.1985

(51) International Patent Classification (IPC):  C02F 1/ 74( . ) C02F 3/ 12( . ) C02F 3/ 00( . ) C02F 3/ 30( . ) (86) International application number: PCT/AU1985/000321 (87) International publication number: WO 1986/003734 (03.07.1986 Gazette 1986/14)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 21.12.1984 AU 19840008674 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Parkville, VIC 3052 (AU)	(72) Inventors: MILLIS, Nancy, Fannie Brighton, VIC 3186 (AU) IP, Sze-Yuen Croydon, VIC 3136 (AU) BRIDGER, John, Stephen Croydon, VIC 3136 (AU)