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:
Jan. 08, 2002
Filed:
Jan. 27, 2000
Sumitomo Electric Industries, Inc., Osaka, JP;
Abstract
A cutting tool according to the present invention is coated with one or more Al O layers on at least a part of the surface of a cBN-based sintered material substrate taking part in cutting. The sintered material substrate is made of cBN in an amount of from 20% to 99% by volume and Al O having an average crystalline particle diameter of not more than 1 &mgr;m in an amount of from not less than 1.0% to less than 10% by volume. The Al O layer has a thickness (d) of from 0.5 &mgr;m to 50 &mgr;m. The average crystalline particle diameter (s) of Al O is from 0.01 &mgr;m to 4 &mgr;m if the thickness (d) of the Al O layer is from 0.5 &mgr;m to 25 &mgr;m or from not less than 0.01 &mgr;m to not more than 10 &mgr;m if the thickness (d) of the Al O layer is from more than 25 &mgr;m to 50 &mgr;m.