(19)

(11)

EP 0 873 194 A1

(12)

(43) Date of publication: 28.10.1998 Bulletin 1998/44 (21) Application number: 95939142.0 (22) Date of filing: 14.11.1995

(51) International Patent Classification (IPC):  B01D 21/ 26( . ) B04C 3/ 00( . ) C02F 1/ 78( . ) B03D 1/ 14( . ) B04C 9/ 00( . ) (86) International application number: PCT/US1995/014754 (87) International publication number: WO 1997/018039 (22.05.1997 Gazette 1997/22)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (71) Applicant: Automatic Control Technology, Inc. San Diego, CA 92121 (US)	(72) Inventors: MOOREHEAD, Jack San Diego, CA 92121 (US) MAUNG, Michael San Diego, CA 92122 (US) (74) Representative: MacGregor, Gordon  Eric Potter Clarkson, Park View House, 58 The Ropewalk Nottingham NG1 5DD Nottingham NG1 5DD (GB)