(19)

(11)

EP 0 792 459 A1

(12)

(43) Date of publication: 03.09.1997 Bulletin 1997/36 (21) Application number: 95936683.0 (22) Date of filing: 14.11.1995

(51) International Patent Classification (IPC):  G01N 33/ 48( . ) G01N 33/ 50( . ) G01N 1/ 28( . ) G01N 33/ 569( . ) (86) International application number: PCT/GB1995/002668 (87) International publication number: WO 1996/015455 (23.05.1996 Gazette 1996/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 15.11.1994 GB 19940022991 (71) Applicant: CORTECS LIMITED Isleworth Middlesex TW7 6RL (GB)	(72) Inventors: PEEK, Keith Saughall, Nr Chester Cheshire CH1 6BJ (GB) SMITH, Christopher, John Rhuallt Clwyd LL17 0TE (GB) (74) Representative: Chapman, Paul William, et al  Kilburn & Strode, 30 John Street London WC1N 2DD London WC1N 2DD (GB)