(19)

(11)

EP 2 164 973 A1

(12)

(43) Date of publication: 24.03.2010 Bulletin 2010/12 (21) Application number: 08768518.6 (22) Date of filing: 17.06.2008

(51) International Patent Classification (IPC):  C12P 7/06(2006.01) B01J 19/08(2006.01) (86) International application number: PCT/US2008/007503 (87) International publication number: WO 2008/156736 (24.12.2008 Gazette 2008/52)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 18.06.2007 US 944547 P (71) Applicant: TENNANT COMPANY Minneapolis, MN 55440 (US)	(72) Inventor: FIELD, Bruce, F. Golden Valley, MN 55422 (US) (74) Representative: Vossius & Partner  Siebertstraße 4 81675 München 81675 München (DE)