(19)

(11)

EP 0 412 136 A1

(12)

(43) Date of publication: 13.02.1991 Bulletin 1991/07 (21) Application number: 90901601.0 (22) Date of filing: 17.01.1990

(51) International Patent Classification (IPC):  D21F 1/ 02( . ) (86) International application number: PCT/FI1990/000018 (87) International publication number: WO 1990/008222 (26.07.1990 Gazette 1990/17)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 23.01.1989 FI 19890000322 (71) Applicant: KATSA OY SF-33900 Tampere (FI)	(72) Inventors: NIEMENMAA, Seppo SF-33820 Tampere (FI) SUNI, Juha SF-33210 Tampere (FI) (74) Representative: Hasenrader, Hubert, et al  Cabinet Beau de Loménie 158, rue de l'Université F-75340 Paris Cédex 07 F-75340 Paris Cédex 07 (FR)