(19)

(11)

EP 0 604 473 A1

(12)

(43) Date of publication: 06.07.1994 Bulletin 1994/27 (21) Application number: 92918505.0 (22) Date of filing: 18.08.1992

(51) International Patent Classification (IPC):  B01J 20/ 34( . ) (86) International application number: PCT/SE1992/000551 (87) International publication number: WO 1993/003835 (04.03.1993 Gazette 1993/06)

(84) Designated Contracting States: AT BE DE DK FR GB LU NL SE (30) Priority: 19.08.1991 SE 19910002384 (71) Applicant: AB Ventilatorverken S-213 75 Malmö (SE)	(72) Inventors: HULTEN, Johan S-234 00 Lomma (SE) OLSSON, Sverker S-240 17 Södra Sandby (SE) (74) Representative: Lundin, Björn-Eric  Trelleborg AB Patents and Trade Marks Box 21024 S-100 31 Stockholm S-100 31 Stockholm (SE)