(19)

(11)

EP 0 269 628 A1

(12)

(43) Date of publication: 08.06.1988 Bulletin 1988/23 (21) Application number: 86905146.0 (22) Date of filing: 15.08.1986

(51) International Patent Classification (IPC):  B01D 24/ 00( . ) B01D 35/ 06( . ) B01D 29/ 01( . ) B03C 5/ 00( . ) (86) International application number: PCT/AU1986/000234 (87) International publication number: WO 1987/001057 (26.02.1987 Gazette 1987/05)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 15.08.1985 AU 19850001958 25.02.1986 AU 19860000047 19.05.1986 AU 19860005962 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Parkville, VIC 3052 (AU)	(72) Inventors: LOCKHART, Neville, Crichton Epping, NSW 2121 (AU) STICKLAND, Ronald, Edmund Roseville, NSW 2069 (AU) (74) Representative: Lawrence, Peter Robin Broughton  GILL JENNINGS & EVERY, Broadgate House, 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)