(19)

(11)

EP 0 436 651 A1

(12)

(43) Date of publication: 17.07.1991 Bulletin 1991/29 (21) Application number: 89911581.0 (22) Date of filing: 29.09.1989

(51) International Patent Classification (IPC):  A01N( . ) A01N 25/ 02( . ) A01N 53/ 00( . ) A01N 25/ 00( . ) A01N 25/ 04( . ) B01F 17/ 00( . ) (86) International application number: PCT/GB1989/001159 (87) International publication number: WO 1990/003111 (05.04.1990 Gazette 1990/08)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 30.09.1988 GB 19880022937 (71) Applicant: NC DEVELOPMENT INC Irving, TX 75062 (US)	(72) Inventor: DAWSON, Howard, Bernard Derby DE3 2GF (GB) (74) Representative: Sheard, Andrew Gregory, et al  Kilburn & Strode 30, John Street London WC1N 2DD London WC1N 2DD (GB)