(19)

(11)

EP 0 494 210 A1

(12)

(43) Date of publication: 15.07.1992 Bulletin 1992/29 (21) Application number: 90914469.0 (22) Date of filing: 25.09.1990

(51) International Patent Classification (IPC):  G01N 33/ 543( . ) G01N 33/ 68( . ) (86) International application number: PCT/AU1990/000453 (87) International publication number: WO 1991/004492 (04.04.1991 Gazette 1991/08)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 25.09.1989 AU 19890006558 (71) Applicant: AGEN LIMITED Acacia Ridge Queensland 4110 (AU)	(72) Inventors: HILLYARD, Carmel, Judith Paddington, QLD 4064 (AU) RYLATT, Dennis, Brian Bardon, QLD 4065 (AU) (74) Representative: Lord, Hilton David  MARKS & CLERK, 57-60 Lincoln's Inn Fields London WC2A 3LS London WC2A 3LS (GB)