(19)

(11)

EP 0 621 803 A1

(12)

(43) Date of publication: 02.11.1994 Bulletin 1994/44 (21) Application number: 93902397.0 (22) Date of filing: 15.01.1993

(51) International Patent Classification (IPC):  B01L 3/ 00( . ) G01N 33/ 543( . ) (86) International application number: PCT/GB1993/000097 (87) International publication number: WO 1993/013856 (22.07.1993 Gazette 1993/18)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 18.01.1992 GB 19920001089 (71) Applicant: GENERA TECHNOLOGIES LIMITED Birmingham B26 3JZ (GB)	(72) Inventor: PARTON, Adrian Mildenhall Suffolk IP28 7BS (GB) (74) Representative: Smart, Peter John  W.H. BECK, GREENER & CO 7 Stone Buildings Lincoln's Inn London WC2A 3SZ London WC2A 3SZ (GB)