(19)

(11)

EP 0 477 185 A1

(12)

(43) Date of publication: 01.04.1992 Bulletin 1992/14 (21) Application number: 90906317.0 (22) Date of filing: 25.04.1990

(51) International Patent Classification (IPC):  B01D 35/ 143( . ) B01D 37/ 04( . ) (86) International application number: PCT/GB1990/000634 (87) International publication number: WO 1990/014144 (29.11.1990 Gazette 1990/27)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 15.05.1989 GB 19890011059 (71) Applicant: BIO-FLO LIMITED Glasgow G41 1ST (GB)	(72) Inventor: HOOD, Robert, Gordon Paisley PA2 6HW (GB) (74) Representative: Naismith, Robert Stewart, et al  CRUIKSHANK & FAIRWEATHER 19 Royal Exchange Square Glasgow, G1 3AE Scotland Glasgow, G1 3AE Scotland (GB)