(19)
(11) EP 2 307 659 A2

(12)

(88) Date of publication A3:
25.03.2010

(43) Date of publication:
13.04.2011 Bulletin 2011/15

(21) Application number: 09763484.4

(22) Date of filing: 10.06.2009
(51) International Patent Classification (IPC): 
E21B 10/46(2006.01)
B22F 3/14(2006.01)
C22C 29/00(2006.01)
E21B 10/54(2006.01)
C22C 1/05(2006.01)
(86) International application number:
PCT/US2009/046810
(87) International publication number:
WO 2009/152194 (17.12.2009 Gazette 2009/51)
(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 MK MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA RS

(30) Priority: 10.06.2008 US 136456

(71) Applicants:
  • Baker Hughes Incorporated
    Houston, TX 77027 (US)
  • Stevens, John H.
    The Woodlands, TX 77380 (US)

(72) Inventors:
  • STEVENS, John, H.
    The Woodlands, TX 77380 (US)
  • CHRISTIE, James, Larry
    The Woodlands, TX 77380 (US)

(74) Representative: Hano, Christian 
v. Füner Ebbinghaus Finck Hano Patentanwälte Mariahilfplatz 3
81541 München
81541 München (DE)

   


(54) COMPOSITE METAL, CEMENTED CARBIDE BIT CONSTRUCTION