(19)

(11)

EP 0 321 549 A1

(12)

(43) Date of publication: 28.06.1989 Bulletin 1989/26 (21) Application number: 88906389.0 (22) Date of filing: 09.06.1988

(51) International Patent Classification (IPC):  B01D 19/ 00( . ) (86) International application number: PCT/US1988/002020 (87) International publication number: WO 1988/010143 (29.12.1988 Gazette 1988/28)

(84) Designated Contracting States: BE DE FR GB IT (30) Priority: 26.06.1987 US 19870067067 (71) Applicant: BECKMAN INSTRUMENTS, INC. Fullerton, CA 92634 (US)	(72) Inventors: GOODALE, David, Leo Anaheim, CA 92804 (US) HESS, Bradford, K. Orange, CA 92665 (US) (74) Representative: Fitzpatrick, Alan James, et al  Fitzpatricks, 4 West Regent Street Glasgow G2 1RS, Scotland Glasgow G2 1RS, Scotland (GB)