ROTARY DRILL BIT - Patent 0065524

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EP 0 065 524 A1

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(43)	Date of publication:
	01.12.1982 Bulletin 1982/48

(21)	Application number: 81902720.0

(22)	Date of filing: 24.09.1981

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International Patent Classification (IPC):

E21B 10/ 22^{( . )}
E21B 10/ 25^{( . )}
F16C 33/ 78^{( . )}
F16J 15/ 40^{( . )}

E21B 10/ 24^{( . )}
F16C 19/ 54^{( . )}
F16J 15/ 16^{( . )}

(86)	International application number:
	PCT/SE1981/000278

(87)	International publication number:
	WO 1982/001909 (10.06.1982 Gazette 1982/15)

(84)	Designated Contracting States:
	DE FR GB NL

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Priority:

02.12.1980 SE 19800008430

(71)	Applicants:
	SANDVIK AKTIEBOLAG S-811 81 Sandviken 1 (SE) Aktiebolaget SKF S-415 50 Göteborg (SE)

(72)	Inventors:
	KARLSSON, Lennart S-811 60 Sandviken (SE) NORLANDER, Gösta S-445 00 Surte (SE)

(74)	Representative: Forsberg, Lars-Ake, et al
	Sandvik Aktiebolag Patents and Licences Fack S-811 81 Sandviken S-811 81 Sandviken (SE)

(54)	ROTARY DRILL BIT