(19)
(11) EP 2 831 361 A1

(12)

(43) Date of publication:
04.02.2015 Bulletin 2015/06

(21) Application number: 13768527.7

(22) Date of filing: 22.03.2013
(51) International Patent Classification (IPC): 
E21B 7/20(2006.01)
(86) International application number:
PCT/US2013/033546
(87) International publication number:
WO 2013/148521 (03.10.2013 Gazette 2013/40)
(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

(30) Priority: 26.03.2012 US 201261615518 P

(71) Applicants:
  • Ashmin LC
    Conroe, TX 77301 (US)
  • Von Gynz-Rekowski, Gunther H-H
    Conroe, TX 77301 (US)
  • Herben, William, C.
    Magnolia, TX 77355 (US)
  • Williams, Michael, V.
    Montgomery, TX 77356 (US)

(72) Inventors:
  • VON GYNZ-REKOWSKI, Gunther H-H
    Conroe, TX 77301 (US)
  • HERBEN, William, C.
    Magnolia, TX 77355 (US)
  • WILLIAMS, Michael, V.
    Montgomery, TX 77356 (US)

(74) Representative: Murnane, Graham John 
Murgitroyd & Company Scotland House 165-169 Scotland Street
Glasgow G5 8PL
Glasgow G5 8PL (GB)

   


(54) HAMMER DRILL