(19)

(11)

EP 0 374 148 A1

(12)

(43) Date of publication: 27.06.1990 Bulletin 1990/26 (21) Application number: 88903750.0 (22) Date of filing: 29.04.1988

(51) International Patent Classification (IPC):  G01N 21/ 74( . ) (86) International application number: PCT/AU1988/000122 (87) International publication number: WO 1988/008527 (03.11.1988 Gazette 1988/24)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (30) Priority: 29.04.1987 AU 19870001645 (71) Applicant: The State of Queensland Brisbane Queensland 4000 (AU)	(72) Inventor: STEINER, John, William Rosalie, QLD 4064 (AU) (74) Representative: Hands, Horace Geoffrey, et al  GEORGE FUERY & CO Whitehall Chambers 23 Colmore Row Birmingham B3 2BL Birmingham B3 2BL (GB)