(19)

(11)

EP 0 831 971 A1

(12)

(43) Date of publication: 01.04.1998 Bulletin 1998/14 (21) Application number: 95929354.0 (22) Date of filing: 02.08.1995

(51) International Patent Classification (IPC):  B01D 51/ 00( . ) B03C 3/ 013( . ) B01D 51/ 04( . ) (86) International application number: PCT/US1995/009746 (87) International publication number: WO 1996/040436 (19.12.1996 Gazette 1997/03)

(84) Designated Contracting States: DE DK ES FR GB GR IT PT SE (30) Priority: 07.06.1995 US 19950483076 (71) Applicant: ADA TECHNOLOGIES, INC. Englewood, CO 80112 (US)

(72) Inventors: DURHAM, Michael, Dean Castle Rock, CO 80101 (US) SCHLAGER, Richard, John Aurora, CO 80015 (US) EBNER, Timothy, George Westminster, CO 80030 (US) STEWART, Robin, Michele Arvada, CO 80004 (US) BUSTARD, Cynthia, Jean Littleton, CO 80127 (US) SJOSTROM, Sharon Denver, CO 80205 (US) HYATT, David, E. Denver, CO 80206 (US) (74) Representative: Targett, Kenneth Stanley  Strathblane House, St. Andrew's Park Horton Heath, Hampshire SO50 7DG Horton Heath, Hampshire SO50 7DG (GB)