(19)

(11)

EP 2 513 381 A2

(12)

(88) Date of publication A3: 27.10.2011 (43) Date of publication: 24.10.2012 Bulletin 2012/43 (21) Application number: 10842457.3 (22) Date of filing: 08.12.2010

(51) International Patent Classification (IPC):  E02F 3/43(2006.01) E02F 3/38(2006.01) E02F 3/42(2006.01) (86) International application number: PCT/US2010/059427 (87) International publication number: WO 2011/084320 (14.07.2011 Gazette 2011/28)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 17.12.2009 US 640471 (71) Applicant: Caterpillar Inc. Peoria, IL 61629-9510 (US)	(72) Inventors: TRACY, William, C. Raleigh, NC 27603-3009 (US) STALLINGS, Michael, R. Clayton, NC 27520-5522 (US) (74) Representative: Wagner & Geyer  Partnerschaft Patent- und Rechtsanwälte Gewürzmühlstrasse 5 80538 München 80538 München (DE)