(19)

(11)

EP 0 923 782 A1

(12)

(43) Date of publication: 23.06.1999 Bulletin 1999/25 (21) Application number: 96929851.0 (22) Date of filing: 04.09.1996

(51) International Patent Classification (IPC):  H01F 41/ 12( . ) H01F 41/ 00( . ) H01F 27/ 32( . ) (86) International application number: PCT/US1996/014048 (87) International publication number: WO 1998/010448 (12.03.1998 Gazette 1998/10)

(84) Designated Contracting States: DE FR GB IT (71) Applicant: E.I. DU PONT DE NEMOURS & COMPANY INCORPORATED Wilmington Delaware 19898 (US)	(72) Inventors: SHEER, M., Lana Kennett Square, PA 19348-2117 (US) BENARBA, Abdelkader Glassboro, NJ 08028-2831 (US) PATTERSON, James, Francis, Boys Newark, DE 19711-4375 (US) KOZIELSKI, Gary, Paul Newark, DE 19711-2827 (US) (74) Representative: Jones, Alan John  CARPMAELS & RANSFORD 43 Bloomsbury Square London, WC1A 2RA London, WC1A 2RA (GB)