(19)

(11)

EP 0 362 343 A1

(12)

(43) Date of publication: 11.04.1990 Bulletin 1990/15 (21) Application number: 89903786.0 (22) Date of filing: 01.03.1989

(51) International Patent Classification (IPC):  B01D 17/ 02( . ) B01D 17/ 038( . ) B01D 17/ 032( . ) E03F 5/ 16( . ) (86) International application number: PCT/GB1989/000211 (87) International publication number: WO 1989/007971 (08.09.1989 Gazette 1989/21)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 02.03.1988 GB 19880004922 (71) Applicant: HILL-VENNING, John Somerset TA14 5AL (GB)	(72) Inventor: HILL-VENNING, John Somerset TA14 5AL (GB) (74) Representative: Cheyne, John Robert Alexander Mackenzie, et al  HASELTINE LAKE & CO. 28 Southampton Buildings Chancery Lane London WC2A 1AT London WC2A 1AT (GB)