(19)

(11)

EP 0 491 696 A1

(12)

(43) Date of publication: 01.07.1992 Bulletin 1992/27 (21) Application number: 90907082.0 (22) Date of filing: 10.05.1990

(51) International Patent Classification (IPC):  B01D 1/ 26( . ) B01D 3/ 06( . ) (86) International application number: PCT/FI1990/000129 (87) International publication number: WO 1990/013342 (15.11.1990 Gazette 1990/26)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 10.05.1989 FI 19890002239 (71) Applicant: INVENTIO OY SF-02440 Luoma (FI)	(72) Inventor: SAARI, Risto SF-02440 Luoma (FI) (74) Representative: Goddar, Heinz J., Dr.  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)