(19)

(11)

EP 1 973 622 A2

(12)

(88) Date of publication A3: 26.01.2006 (43) Date of publication: 01.10.2008 Bulletin 2008/40 (21) Application number: 05713602.0 (22) Date of filing: 21.01.2005

(51) International Patent Classification (IPC):  B01D 3/00(2006.01) C10B 9/00(2006.01) (86) International application number: PCT/US2005/004794 (87) International publication number: WO 2005/072481 (11.08.2005 Gazette 2005/32)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 29.01.2004 US 767838 29.01.2004 US 767871 (71) Applicant: Oil-Tech., Inc. Payson UT 84651 (US)	(72) Inventors: MERRELL, Byron, G. Vernal, UT 84078 (US) KELLER, Michael, R. Tulsa, OK 74170 (US) NOBLE, Roger, K. Tulsa, OK 74170 (US) (74) Representative: Pawlyn, Anthony Neil  Urquhart-Dykes & Lord LLP Tower North Central Merrion Way Leeds LS2 8PA Merrion Way Leeds LS2 8PA (GB)