(19)

(11)

EP 0 404 813 A1

(12)

(43) Date of publication: 02.01.1991 Bulletin 1991/01 (21) Application number: 89903822.0 (22) Date of filing: 17.03.1989

(51) International Patent Classification (IPC):  B01D 53/ 72( . ) (86) International application number: PCT/SE1989/000143 (87) International publication number: WO 1989/008492 (21.09.1989 Gazette 1989/23)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 17.03.1988 SE 19880000972 (71) Applicant: APP ARMERADE PLASTPRODUKTER AB S-951 21 Lulea (SE)	(72) Inventor: NILSSON, Lars S-955 00 Ranea (SE) (74) Representative: Onn, Thorsten  AB STOCKHOLMS PATENTBYRA Zacco & Bruhn P.O. Box 23101 S-104 35 Stockholm S-104 35 Stockholm (SE)