(19)

(11)

EP 0 457 780 A1

(12)

(43) Date of publication: 27.11.1991 Bulletin 1991/48 (21) Application number: 90902264.0 (22) Date of filing: 08.02.1990

(51) International Patent Classification (IPC):  B28B 7/ 34( . ) F02B 3/ 06( . ) C04B 28/ 36( . ) (86) International application number: PCT/FI1990/000042 (87) International publication number: WO 1990/009265 (23.08.1990 Gazette 1990/20)

(84) Designated Contracting States: AT BE DE NL SE (30) Priority: 08.02.1989 FI 19890000604 (71) Applicant: KAUTAR OY SF-37800 Toijala (FI)	(72) Inventor: VIRTANEN, Pentti SF-37800 Toijala (FI) (74) Representative: Säfwenberg, Björn, et al  Axel Ehrners Patentbyra AB Box 10316 S-100 55 Stockholm S-100 55 Stockholm (SE)