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(11)

EP 3 292 265 A1

(12)

(43) Date of publication: 14.03.2018 Bulletin 2018/11 (21) Application number: 16790110.7 (22) Date of filing: 05.05.2016

(51) International Patent Classification (IPC):  E21B 23/00(2006.01) E21B 23/02(2006.01) E21B 23/01(2006.01) (86) International application number: PCT/US2016/031048 (87) International publication number: WO 2016/179429 (10.11.2016 Gazette 2016/45)

(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 Designated Extension States: BA ME Designated Validation States: MA MD (30) Priority: 05.05.2015 US 201562157292 P (71) Applicant: Robertson Intellectual Properties, LLC Arlington, TX 76001 (US)	(72) Inventors: ROBERTSON, Michael, C. Arlington, TX 76001 (US) GRATTAN, Antony, F. Arlington, TX 76001 (US) STREIBICH, Douglas, J. Arlington, TX 76001 (US) LAXALT, Marcelo, J. Arlington, TX 76001 (US) (74) Representative: Johnson, Yvonne Catherine  Barker Brettell LLP 100 Hagley Road Edgbaston Birmingham B16 8QQ Edgbaston Birmingham B16 8QQ (GB)