(19)

(11)

EP 0 383 860 A1

(12)

(43) Date of publication: 29.08.1990 Bulletin 1990/35 (21) Application number: 89907479.0 (22) Date of filing: 31.05.1989

(51) International Patent Classification (IPC):  G01N 33/ 543( . ) G01N 33/ 58( . ) (86) International application number: PCT/US1989/002372 (87) International publication number: WO 1990/000252 (11.01.1990 Gazette 1990/02)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 27.06.1988 US 19880212350 (71) Applicant: BECKMAN INSTRUMENTS, INC. Fullerton, CA 92634 (US)	(72) Inventor: STERNBERG, James, C. Fullerton, CA 92635 (US) (74) Representative: Buchan, Ian Alexander  Fitzpatricks 4 West Regent Street Glasgow G2 1RS Glasgow G2 1RS (GB)