(19)

(11)

EP 0 762 833 A2

(12)

(43) Date of publication: 19.03.1997 Bulletin 1997/12 (21) Application number: 95913687.0 (22) Date of filing: 20.03.1995

(51) International Patent Classification (IPC):  A01N 43/ 653( . ) (86) International application number: PCT/US1995/003188 (87) International publication number: WO 1995/032621 (07.12.1995 Gazette 1995/52)

(84) Designated Contracting States: ES FR IT (30) Priority: 27.05.1994 US 19940250400 (71) Applicants: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US) Degussa Aktiengesellschaft 60311 Frankfurt (DE)	(72) Inventor: AMUTI, Kofi, Sam Wilmington, DE 19808 (US) (74) Representative: Woodman, Derek, et al  Frank B. Dehn & Co., European Patent Attorneys, 179 Queen Victoria Street London EC4V 4EL London EC4V 4EL (GB)