(19)

(11)

EP 0 496 784 A1

(12)

(43) Date of publication: 05.08.1992 Bulletin 1992/32 (21) Application number: 90915595.0 (22) Date of filing: 10.10.1990

(51) International Patent Classification (IPC):  B01L 3/ 02( . ) G01N 1/ 00( . ) (86) International application number: PCT/US1990/005800 (87) International publication number: WO 1991/005609 (02.05.1991 Gazette 1991/10)

(84) Designated Contracting States: DE FR GB (30) Priority: 20.10.1989 US 19890424408 (71) Applicant: COSTAR CORPORATION Cambridge Massachusetts 02140 (US)	(72) Inventor: LABRIOLA, Anthony, M. Woburn, MA 01801 (US) (74) Representative: Read, Matthew Charles, et al  Venner Shipley & Co. 20 Little Britain London EC1A 7DH London EC1A 7DH (GB)