(19)

(11)

EP 0 316 348 A1

(12)

(43) Date of publication: 24.05.1989 Bulletin 1989/21 (21) Application number: 87905229.0 (22) Date of filing: 03.08.1987

(51) International Patent Classification (IPC):  B01D 21/ 01( . ) C02F 1/ 54( . ) C02F 1/ 52( . ) (86) International application number: PCT/GB1987/000549 (87) International publication number: WO 1988/000927 (11.02.1988 Gazette 1988/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 04.08.1986 US 19860892831 07.05.1987 IE 19870001133 07.05.1987 IE 19870001134 (71) Applicant: CONTINENTAL MANUFACTURING & SALES INC. Saskatoon Saskatchewan S7N 1Y3 (CA)	(72) Inventors: CONNAUGHTON, Noel Athleague Co. Roscommon (IE) POHORESKI, Anton Saskatoon Saskatchewan S7N 1Y3 (CA) (74) Representative: Bannerman, David Gardner  Withers & Rogers 4 Dyer's Buildings Holborn London, EC1N 2JT London, EC1N 2JT (GB)