(19)

(11)

EP 0 138 998 A1

(12)

(43) Date of publication: 02.05.1985 Bulletin 1985/18 (21) Application number: 84901835.0 (22) Date of filing: 05.03.1984

(51) International Patent Classification (IPC):  G01J 3/ 45( . ) G01J 9/ 02( . ) G01J 3/ 453( . ) (86) International application number: PCT/US1984/000362 (87) International publication number: WO 1984/003558 (13.09.1984 Gazette 1984/22)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 07.03.1983 US 19830472539 (71) Applicant: BECKMAN INSTRUMENTS, INC. Fullerton California 92634 (US)	(72) Inventors: WIJNTJES, Geert Belmont, MA 02178 (US) HERCHER, Michael Marblehead, MA 01945 (US) (74) Representative: Wotherspoon, Graham, et al  FITZPATRICKS 4 West Regent Street Glasgow G2 1RS Scotland Glasgow G2 1RS Scotland (GB)