(19)

(11)

EP 0 645 961 A1

(12)

(43) Date of publication: 05.04.1995 Bulletin 1995/14 (21) Application number: 93915220.0 (22) Date of filing: 10.06.1993

(51) International Patent Classification (IPC):  A01N 25/ 10( . ) A01N 25/ 30( . ) A01N 47/ 36( . ) A01N 25/ 14( . ) A01N 43/ 54( . ) (86) International application number: PCT/US1993/005371 (87) International publication number: WO 1993/025074 (23.12.1993 Gazette 1993/30)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE (30) Priority: 16.06.1992 US 19920899405 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: FREEMAN, Roy, Quinn, III Wilmington, DE 19808 (US) SANDELL, Lionel, Samuel Wilmington, DE 19810-2247 (US) ZAUCHA, Thomas, Joseph Newark, DE 19711-2430 (US) (74) Representative: Hildyard, Edward Martin  Frank B. Dehn & Co. Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)