(19)

(11)

EP 0 376 972 A1

(12)

(43) Date of publication: 11.07.1990 Bulletin 1990/28 (21) Application number: 88907328.0 (22) Date of filing: 22.08.1988

(51) International Patent Classification (IPC):  B42F 13/ 40( . ) G02B 27/ 04( . ) (86) International application number: PCT/FI1988/000133 (87) International publication number: WO 1989/001645 (23.02.1989 Gazette 1989/05)

(84) Designated Contracting States: AT BE DE FR GB IT LU NL SE (30) Priority: 20.08.1987 FI 19870003596 (71) Applicant: KUVASAMPO OY SF-00101 Helsinki (FI)	(72) Inventor: SILVENNOINEN, Pirkko, Maila, Tellervo SF-02700 Kauniainen (FI) (74) Representative: Harland, Linda Jane, et al  c/o Reddie & Grose 16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)