(19)

(11)

EP 0 521 042 A1

(12)

(43) Date of publication: 07.01.1993 Bulletin 1993/01 (21) Application number: 91906231.0 (22) Date of filing: 26.02.1991

(51) International Patent Classification (IPC):  G03H 1/ 18( . ) G03H 1/ 02( . ) (86) International application number: PCT/US1991/001262 (87) International publication number: WO 1991/014975 (03.10.1991 Gazette 1991/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 22.03.1990 US 19900497960 22.03.1990 US 19900498163 (71) Applicant: MONSANTO COMPANY St. Louis Missouri 63167 (US)	(72) Inventors: MORGAN, Albert, Wayne Chesterfield, MO 63017 (US) TAYLOR, David, Lawrence St. Louis, MO 63119 (US) TOKAS, Edward, Francis St. Louis, MO 63141 (US) VAUGHN, George, Douglas Ballwin, MO 63011 (US) (74) Representative: Ernst, Hubert  Monsanto Services International S.A. Patent Department Avenue de Tervuren 270-272 Letter Box No. 21 B-1150 Brussels B-1150 Brussels (BE)