(19)

(11)

EP 0 909 207 A1

(12)

(43) Date of publication: 21.04.1999 Bulletin 1999/16 (21) Application number: 97930996.0 (22) Date of filing: 23.05.1997

(51) International Patent Classification (IPC):  B01D 24/ 08( . ) B01D 35/ 153( . ) (86) International application number: PCT/US1997/008942 (87) International publication number: WO 1997/044111 (27.11.1997 Gazette 1997/51)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 23.05.1996 US 19960018168P 19.08.1996 US 19960023679P (71) Applicant: Martin, John D. Wichita Falls, TX 76309 (US)	(72) Inventor: Martin, John D. Wichita Falls, TX 76309 (US) (74) Representative: UEXKÜLL & STOLBERG  Patentanwälte Beselerstrasse 4 22607 Hamburg 22607 Hamburg (DE)