(19)

(11)

EP 0 436 563 A1

(12)

(43) Date of publication: 17.07.1991 Bulletin 1991/29 (21) Application number: 89909329.0 (22) Date of filing: 20.07.1989

(51) International Patent Classification (IPC):  B01L 3/ 00( . ) (86) International application number: PCT/US1989/003179 (87) International publication number: WO 1990/003564 (05.04.1990 Gazette 1990/08)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 30.09.1988 US 19880252176 (71) Applicant: KALLESTAD DIAGNOSTICS, INC. New York, NY 10178 (US)	(72) Inventors: LARSEN, Theodore, J. Minnetonka, MN 55345 (US) CRACAUER, Raymond, F. Plymouth, MN 55447 (US) PUMPHREY, John, G. Eden Prairie, MN 55344 (US) MAHONEY, Walter, C. Minnetonka, MN 55345 (US) (74) Representative: Jones, Alan John  CARPMAELS & RANSFORD 43 Bloomsbury Square London, WC1A 2RA London, WC1A 2RA (GB)