(19)

(11)

EP 1 532 223 A1

(12)

(43) Date of publication: 25.05.2005 Bulletin 2005/21 (21) Application number: 03749028.1 (22) Date of filing: 11.08.2003

(51) International Patent Classification (IPC)7: C09K 7/02, E21B 33/138 (86) International application number: PCT/US2003/025116 (87) International publication number: WO 2004/020546 (11.03.2004 Gazette 2004/11)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 28.08.2002 US 406604 P (71) Applicant: GRAIN PROCESSING CORPORATION Muscatine, Iowa 52761 (US)	(72) Inventors: WIESNER, Thomas, A. Muscatine, IA 52761 (US) ABBOTT, David, W. Muscatine, IA 52761 (US) (74) Representative: W.P. Thompson & Co.  Coopers BuildingChurch Street Liverpool L1 3AB Liverpool L1 3AB (GB)