ROTARY CONE DRILL BIT HAVING A BIT BODY WITH INTEGRAL STABILIZERS - Patent 1131531

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EP 1 131 531 A2

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(88)	Date of publication A3:
	31.08.2000

(43)	Date of publication:
	12.09.2001 Bulletin 2001/37

(21)	Application number: 99962728.4

(22)	Date of filing: 10.11.1999

(51)	International Patent Classification (IPC)⁷: E21B 10/00

(86)	International application number:
	PCT/US9926/491

(87)	International publication number:
	WO 0029/709 (25.05.2000 Gazette 2000/21)

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK

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Priority:

18.11.1998 US 109073 P

(71)	Applicant: Dresser Industries, Inc.
	Carrollton,Texas 75006 (US)

(72)	Inventors:
	DAHLEM, James, S. Midlothian, TX 76065 (US) KNECHT, Karl, Don Arlington, TX 76013 (US)

(74)	Representative: Lawrence, John et al
	Barker Brettell 138 Hagley RoadEdgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)

(54)	ROTARY CONE DRILL BIT HAVING A BIT BODY WITH INTEGRAL STABILIZERS