The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 2004
Filed:
Jan. 18, 2000
Hitoshi Sumiya, Hyogo, JP;
Shinya Uesaka, Hyogo, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
The object of the present invention is to provide a cutting tool consisting of fine grain cBN free from a binder and having a grain size of at most 1 &mgr;m and having a high hardness, high strength and excellent heat resistance. The feature thereof consists in a cutting tool compring, as an edge part, a cubic boron nitride sintered compact containing cubic boron nitride having an average grain diameter of at most 1 &mgr;m, in which the cubic boron nitride sintered compact has, at the said edge part, an I /I of (220) diffraction intensity (I ) to (111) diffraction intensity (I ) ratio of at least 0.05 in X-ray diffraction of arbitrary direction and impurities are substantially not contained in the grain boundaries.