(19)

(11)

EP 0 226 600 A1

(12)

(43) Date of publication: 01.07.1987 Bulletin 1987/27 (21) Application number: 86902967.0 (22) Date of filing: 07.04.1986

(51) International Patent Classification (IPC):  G01N 33/ 543( . ) B01L 3/ 00( . ) (86) International application number: PCT/US1986/000746 (87) International publication number: WO 1986/006004 (23.10.1986 Gazette 1986/23)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 18.04.1985 US 19850724711 (71) Applicant: BECKMAN INSTRUMENTS, INC. Fullerton California 92634 (US)	(72) Inventors: HARRIS, Paul, C. Yorba Linda, CA 92686 (US) STONE, Linda, J. Chino, CA 91709 (US) (74) Representative: Wotherspoon, Graham  FITZPATRICKS 4 West Regent Street Glasgow G2 1RS Scotland Glasgow G2 1RS Scotland (GB)