(19)

(11)

EP 0 112 868 A1

(12)

(43) Date of publication: 11.07.1984 Bulletin 1984/28 (21) Application number: 83902064.0 (22) Date of filing: 16.05.1983

(51) International Patent Classification (IPC):  B01L 3/ 14( . ) (86) International application number: PCT/US1983/000771 (87) International publication number: WO 1984/000313 (02.02.1984 Gazette 1984/03)

(84) Designated Contracting States: CH DE GB LI (30) Priority: 06.07.1982 US 19820395371 (71) Applicant: BECKMAN INSTRUMENTS, INC. Fullerton California 92634 (US)	(72) Inventors: NIELSEN, Steven, T. Sunnyvale, CA 94087 (US) LEE, Carleton, C. San Jose, CA 95127 (US) (74) Representative: Wotherspoon, Graham, et al  FITZPATRICKS 4 West Regent Street Glasgow G2 1RS Scotland Glasgow G2 1RS Scotland (GB)