(19)

(11)

EP 0 866 748 A1

(12)

(43) Date of publication: 30.09.1998 Bulletin 1998/40 (21) Application number: 95936871.0 (22) Date of filing: 18.10.1995

(51) International Patent Classification (IPC):  G01N 1/ 31( . ) (86) International application number: PCT/US1995/013155 (87) International publication number: WO 1997/003827 (06.02.1997 Gazette 1997/07)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 24.07.1995 US 19950506358 (71) Applicant: Innovation Instruments Inc. Tallahassee, FL 32304 (US)	(72) Inventor: Edwards,Peter S. Tallahassee, Florida 32308 (US) (74) Representative: Leeming, John Gerard  J.A. Kemp & Co., 14 South Square, Gray's Inn London WC1R 5LX London WC1R 5LX (GB)