(19)

(11)

EP 0 815 427 A1

(12)

(43) Date of publication: 07.01.1998 Bulletin 1998/02 (21) Application number: 96904938.0 (22) Date of filing: 04.03.1996

(51) International Patent Classification (IPC):  G01N 33/ 15( . ) G01N 13/ 00( . ) (86) International application number: PCT/GB1996/000493 (87) International publication number: WO 1996/028717 (19.09.1996 Gazette 1996/42)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 10.03.1995 GB 19950004893 (71) Applicant: CORTECS LIMITED Isleworth Middlesex TW7 6RL (GB)	(72) Inventors: BARNWELL, Stephen, George Chester CH4 7QY (GB) BURNS, Stephen, John, Oakwood, Derby DE21 2JJ (GB) HIGGINBOTTOM, Simon South Wirral L66 4TJ (GB) (74) Representative: Chapman, Paul William  Kilburn & Strode, 30 John Street London WC1N 2DD London WC1N 2DD (GB)