(19)

(11)

EP 2 148 975 A1

(12)

(43) Date of publication: 03.02.2010 Bulletin 2010/05 (21) Application number: 08726053.5 (22) Date of filing: 26.02.2008

(51) International Patent Classification (IPC):  E21B 44/00(2006.01) (86) International application number: PCT/US2008/002469 (87) International publication number: WO 2008/136883 (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 927400 P (71) Applicants: Kusko, David John Houston, TX 77084 (US) Vecseri, Gabor Houston, TX 77040 (US) Lerner, Daniel Maurice Missouri City, TX 77459 (US)	(72) Inventors: Kusko, David John Houston, TX 77084 (US) Vecseri, Gabor Houston, TX 77040 (US) Lerner, Daniel Maurice Missouri City, TX 77459 (US) (74) Representative: Rüttgers, Joachim  RACKETTE Partnerschaft Patentanwälte Kaiser-Joseph-Strasse 179 79013 Freiburg 79013 Freiburg (DE)