(19)

(11)

EP 0 869 868 A1

(12)

(43) Date of publication: 14.10.1998 Bulletin 1998/42 (21) Application number: 96924401.0 (22) Date of filing: 19.06.1996

(51) International Patent Classification (IPC):  B01D 25/ 12( . ) B01D 25/ 168( . ) B01D 25/ 00( . ) C02F 11/ 12( . ) (86) International application number: PCT/US1996/011470 (87) International publication number: WO 1997/000171 (03.01.1997 Gazette 1997/02)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 19.06.1995 US 19950000315P (71) Applicants: Simpson, Dan Rio Vista, California 94571 (US) Crocco, Gregg Rio Vista, California 94571 (US)	(72) Inventors: Simpson, Dan Rio Vista, California 94571 (US) Crocco, Gregg Rio Vista, California 94571 (US) (74) Representative: Price, Nigel John King  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)