(19)

(11)

EP 0 493 491 A1

(12)

(43) Date of publication: 08.07.1992 Bulletin 1992/28 (21) Application number: 90914683.0 (22) Date of filing: 21.09.1990

(51) International Patent Classification (IPC):  B01D 1/ 18( . ) F26B 17/ 10( . ) F26B 3/ 12( . ) (86) International application number: PCT/DK1990/000240 (87) International publication number: WO 1991/004776 (18.04.1991 Gazette 1991/09)

(84) Designated Contracting States: BE DE DK FR GB IT NL (30) Priority: 26.09.1989 US 19890412741 (71) Applicant: NIRO A/S DK-2860 Soeborg (DK)	(72) Inventors: SCHWARTZBACH, Christian DK-2760 Malov (DK) BRO, Klaus DK-2950 Vedbaek (DK) Hansen, Ove DK-3450 Allerod (DK) (74) Representative: Indahl, Peter Jensen, et al  c/o Internationalt Patent-Bureau Hoeje Taastrup Boulevard 23 DK-2630 Taastrup DK-2630 Taastrup (DK)