(19)

(11)

EP 2 158 151 A2

(12)

(88) Date of publication A3: 06.11.2008 (43) Date of publication: 03.03.2010 Bulletin 2010/09 (21) Application number: 07869900.6 (22) Date of filing: 26.12.2007

(51) International Patent Classification (IPC):  B66C 19/00(2006.01) (86) International application number: PCT/US2007/088816 (87) International publication number: WO 2008/083154 (10.07.2008 Gazette 2008/28)

(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 LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 31.12.2006 US 618859 (71) Applicant: Whiting Corporation Monee, IL 60449 (US)	(72) Inventor: DAVIS, Julian, W., II West Union, SC 29696 (US) (74) Representative: Penny, Daryl  Boult Wade Tennant Verulam Gardens 70 Gray's Inn Road London WC1X 8BT London WC1X 8BT (GB)