(19)

(11)

EP 0 425 574 A1

(12)

(43) Date of publication: 08.05.1991 Bulletin 1991/19 (21) Application number: 89908928.0 (22) Date of filing: 18.07.1989

(51) International Patent Classification (IPC):  H01F 19/ 04( . ) H02M 3/ 28( . ) H02M 3/ 337( . ) H01F 30/ 00( . ) H02M 3/ 325( . ) (86) International application number: PCT/US1989/003098 (87) International publication number: WO 1990/001232 (08.02.1990 Gazette 1990/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 18.07.1988 US 19880220532 12.05.1989 US 19890351944 (71) Applicant: FMTT, INC Simsbury CT 06070 (US)	(72) Inventors: HERBERT, Edward Canton, CT 06109 (US) REPP, John, D. Barkhamsted, CT 06059 (US) CEBRY, Steven, E. Burlington, CT 06103 (US) (74) Representative: Archer, Philip Bruce  Urquhart-Dykes & Lord European Patent Attorneys New Priestgate House 57 Priestgate Peterborough Cambridgeshire PE1 1JX Peterborough Cambridgeshire PE1 1JX (GB)