(19)

(11)

EP 0 438 408 A1

(12)

(43) Date of publication: 31.07.1991 Bulletin 1991/31 (21) Application number: 89905719.0 (22) Date of filing: 21.04.1989

(51) International Patent Classification (IPC):  B01L 11/ 00( . ) B01L 9/ 00( . ) G01N 1/ 28( . ) B01L 3/ 02( . ) G01N 1/ 00( . ) (86) International application number: PCT/GB1989/000432 (87) International publication number: WO 1989/010192 (02.11.1989 Gazette 1989/26)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 22.04.1988 GB 19880009611 (71) Applicant: Darougar, Sohrab Croydon, CR0 5QR (GB)	(72) Inventor: Darougar, Sohrab Croydon, CR0 5QR (GB) (74) Representative: Senior, Alan Murray  J.A. KEMP & CO., 14 South Square, Gray's Inn London WC1R 5LX London WC1R 5LX (GB)