(19)

(11)

EP 0 502 033 A1

(12)

(43) Date of publication: 09.09.1992 Bulletin 1992/37 (21) Application number: 90917218.0 (22) Date of filing: 20.11.1990

(51) International Patent Classification (IPC):  A01N 1/ 00( . ) A01N 3/ 00( . ) A23L 3/ 30( . ) A23L 3/ 375( . ) A61J 3/ 00( . ) F25C 1/ 00( . ) F26B 5/ 06( . ) A01N 1/ 02( . ) A23G 9/ 04( . ) A23L 3/ 36( . ) A23L 3/ 44( . ) C12N 1/ 04( . ) F25D 25/ 00( . ) (86) International application number: PCT/GB1990/001783 (87) International publication number: WO 1991/007085 (30.05.1991 Gazette 1991/12)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 20.11.1989 GB 19890026189 01.03.1990 GB 19900004606 06.04.1990 GB 19900007845 (71) Applicant: CELL SYSTEMS LTD Cambridge CB4 4FY (GB)	(72) Inventor: MORRIS, George, John Bourn Cambridge CB4 7SX (GB) (74) Representative: Sheard, Andrew Gregory  Kilburn & Strode 30, John Street London WC1N 2DD London WC1N 2DD (GB)