(19)

(11)

EP 0 397 856 A1

(12)

(43) Date of publication: 22.11.1990 Bulletin 1990/47 (21) Application number: 90901265.0 (22) Date of filing: 22.11.1989

(51) International Patent Classification (IPC):  B01D 53/ 86( . ) (86) International application number: PCT/US1989/005209 (87) International publication number: WO 1990/005577 (31.05.1990 Gazette 1990/12)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI LU NL SE (30) Priority: 23.11.1988 CA 19880583937 29.11.1988 US 19880277254 (71) Applicants: The Governors of the University of Alberta Edmonton, Alberta T6G 2J9 (CA) BASSI, Pawan Kumar Benicia, CA 94510 (US)	(72) Inventors: BASSI, Pawan, Kumar Benicia, CA 94510 (US) EASTWELL, Kenneth, Charles Porty Moody, British Columbia V3H 3N1 (CA) GOUDEY, James, Stephen Sherwood Park, Alberta T8A 4Z2 (CA) SPENCER, Mary, Eileen Edmonton, Alberta T5R 0C1 (CA) (74) Representative: Fisher, Bernard  Raworth, Moss & Cook 36 Sydenham Road Croydon Surrey CR0 2EF Croydon Surrey CR0 2EF (GB)