(19)

(11)

EP 0 453 470 A1

(12)

(43) Date of publication: 30.10.1991 Bulletin 1991/44 (21) Application number: 90901710.0 (22) Date of filing: 09.01.1990

(51) International Patent Classification (IPC):  A01M 1/ 02( . ) A01M 1/ 20( . ) (86) International application number: PCT/US1990/000035 (87) International publication number: WO 1990/007875 (26.07.1990 Gazette 1990/17)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 13.01.1989 US 19890296747 19.04.1989 US 19890340286 19.04.1989 US 19890340287 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington Delaware 19898 (US)	(72) Inventors: FOSTER, James, Perry Chadds Ford, PA 19317 (US) JENNINGS, Philip, Vaughan Wilmington, DE 19808 (US) (74) Representative: Hildyard, Edward Martin, et al  Frank B. Dehn & Co. European Patent Attorneys Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)