(19)

(11)

EP 0 832 445 A1

(12)

(43) Date of publication: 01.04.1998 Bulletin 1998/14 (21) Application number: 97915456.0 (22) Date of filing: 27.03.1997

(51) International Patent Classification (IPC):  G02C 5/ 22( . ) (86) International application number: PCT/EP1997/001591 (87) International publication number: WO 1997/039377 (23.10.1997 Gazette 1997/45)

(84) Designated Contracting States: AT CH DE FR GB LI (30) Priority: 16.04.1996 IT 1996PD00093 (71) Applicant: VISOTTICA S.p.A. I-31058 Susegana (Province of Treviso) (IT)	(72) Inventor: MONTALBAN, Rinaldo I-30124 Venezia (IT) (74) Representative: Modiano, Guido, Dr.-Ing., et al  Modiano & Associati S.r.l. Via Meravigli, 16 20123 Milano 20123 Milano (IT)