DEVICE FOR STEERING THE DIRECTION OF DRILLING - Patent 0391899

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EP 0 391 899 A1

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(43)	Date of publication:
	17.10.1990 Bulletin 1990/42

(21)	Application number: 88906141.0

(22)	Date of filing: 07.07.1988

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International Patent Classification (IPC):

E21B^{( . )}
E21B 7/ 06^{( . )}
E21B 17/ 10^{( . )}
E21B 47/ 024^{( . )}

E21B 7/ 04^{( . )}
E21B 7/ 08^{( . )}
E21B 25/ 00^{( . )}

(86)	International application number:
	PCT/NO1988/000057

(87)	International publication number:
	WO 1990/000666 (25.01.1990 Gazette 1990/03)

(84)	Designated Contracting States:
	DE GB SE

(71)	Applicant: STIFTELSEN FOR INDUSTRIELL OG TEKNISK FORSKNING VED NTH (SINTEF)
	N-7034 Trondheim (NO)

(72)	Inventor:
	TOKLE, Viktor N-7087 Gimse (NO)

(74)	Representative: Burrows, Anthony Gregory, et al
	Business Centre West Avenue One, Business Park Letchworth Garden City Hertfordshire SG6 2HB Letchworth Garden City Hertfordshire SG6 2HB (GB)

(54)	DEVICE FOR STEERING THE DIRECTION OF DRILLING