(19)

(11)

EP 0 514 376 A1

(12)

(43) Date of publication: 25.11.1992 Bulletin 1992/48 (21) Application number: 90912512.0 (22) Date of filing: 06.08.1990

(51) International Patent Classification (IPC):  C23F 11/ 06( . ) C23F 11/ 173( . ) C23F 11/ 14( . ) (86) International application number: PCT/US1990/004378 (87) International publication number: WO 1991/012354 (22.08.1991 Gazette 1991/19)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 06.02.1990 US 19900475505 06.02.1990 US 19900475506 (71) Applicant: MONSANTO COMPANY St. Louis Missouri 63167 (US)	(72) Inventors: KALOTA, Dennis, Jerome Fenton, MO 63026 (US) SILVERMAN, David, Charles Chesterfield, MO 63017 (US) (74) Representative: Ernst, Hubert, et al  Monsanto Services International S.A. Patent Department Avenue de Tervuren 270-272 Letter Box No. 21 B-1150 Brussels B-1150 Brussels (BE)