(19)

(11)

EP 0 799 084 A1

(12)

(43) Date of publication: 08.10.1997 Bulletin 1997/41 (21) Application number: 95942354.0 (22) Date of filing: 21.12.1995

(51) International Patent Classification (IPC):  B01D 53/ 14( . ) B01D 53/ 68( . ) B01D 53/ 50( . ) B01D 53/ 81( . ) (86) International application number: PCT/SE1995/001557 (87) International publication number: WO 1996/020038 (04.07.1996 Gazette 1996/30)

(84) Designated Contracting States: AT DE DK ES FR GB IT NL (30) Priority: 23.12.1994 SE 19940004505 (71) Applicant: ABB FLÄKT AB S-120 86 Stockholm (SE)	(72) Inventor: BENGTSSON, Sune S-352 53 Växjö (SE) (74) Representative: Jenkler, Malte, et al  Asea Brown Boveri AB Patent Stockholm Office 120 86 Stockholm 120 86 Stockholm (SE)