(19)

(11)

EP 0 136 319 A1

(12)

(43) Date of publication: 10.04.1985 Bulletin 1985/15 (21) Application number: 84900952.0 (22) Date of filing: 07.03.1984

(51) International Patent Classification (IPC):  C04B 2/ 00( . ) C01F 5/ 24( . ) C01F 5/ 06( . ) (86) International application number: PCT/AU1984/000036 (87) International publication number: WO 1984/003490 (13.09.1984 Gazette 1984/22)

(84) Designated Contracting States: AT DE FR (30) Priority: 07.03.1983 AU 19830008329 (71) Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION Parkville, VIC 3052 (AU)	(72) Inventor: CANTERFORD, John, Harmsworth Croydon, VIC 3136 (AU) (74) Representative: Miller, Joseph, et al  J. MILLER & CO. 34 Bedford Row, Holborn London WC1R 4JH London WC1R 4JH (GB)