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(11)

EP 2 153 009 A1

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(43) Date of publication: 17.02.2010 Bulletin 2010/07 (21) Application number: 08754183.5 (22) Date of filing: 02.05.2008

(51) International Patent Classification (IPC):  E21B 7/04(2006.01) E21B 44/00(2006.01) (86) International application number: PCT/US2008/005637 (87) International publication number: WO 2008/137042 (13.11.2008 Gazette 2008/46)

(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: 03.05.2007 US 927746 P (71) Applicant: Vermeer Manufacturing Company Pella, IA 50219 (US)	(72) Inventors: CARLSON, Robin, W. Pella, IA 50219 (US) LANE, Philip, R. Pella, IA 50219 (US) (74) Representative: Eisenführ, Speiser & Partner  Johannes-Brahms-Platz 1 20355 Hamburg 20355 Hamburg (DE)