(19)

(11)

EP 0 634 955 A1

(12)

(43) Date of publication: 25.01.1995 Bulletin 1995/04 (21) Application number: 93912126.0 (22) Date of filing: 05.04.1993

(51) International Patent Classification (IPC):  B01D 53/ 86( . ) C01B 17/ 80( . ) B03C 3/ 14( . ) (86) International application number: PCT/US1993/003193 (87) International publication number: WO 1993/019852 (14.10.1993 Gazette 1993/25)

(84) Designated Contracting States: ES IT (30) Priority: 07.04.1992 US 19920864847 14.05.1992 US 19920882835 01.07.1992 US 19920907159 24.07.1992 US 19920919525 30.07.1992 US 19920922576 (71) Applicant: WILHELM ENVIRONMENTAL TECHNOLOGIES, INC. Indianapolis, IN 46203 (US)	(72) Inventors: WRIGHT, Robert, Allen Indianapolis, IN 46250 (US) WORACEK, David, Luis Federal Way, WA 98003 (US) BATTLES, Richard, L. New Palestine, IN 46163 (US) LENTZ, Michael, J. Indianapolis, IN 46219 (US) (74) Representative: Goodenough, Nigel, et al  A.A. Thornton & Co. Northumberland House 303-306 High Holborn London WC1V 7LE London WC1V 7LE (GB)