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. 14, 2002
Filed:
Sep. 02, 1999
Applicant:
Inventors:
Assignee:
NGK Spark Plug Co., Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B 9/00 ;
U.S. Cl.
CPC ...
B32B 9/00 ;
Abstract
A diamond-coated hard metal member comprising a WC-based hard metal substrate having a roughened surface formed by electrolytic etching and a diamond coat layer coating the roughened surface with an interlayer provided interposed therebetween. The interlayer coats the substrate, and is a W layer having a roughened surface corresponding to the roughened surface of the substrate. The unetched substrate comprises disperse phases dispersed therein in an amount of from 2 to 5 mol-%, and has disperse phases having an average longest diameter of from not less than 0.5 &mgr;m to less than 2 &mgr;m on the surface thereof in a density of from not less than 0.1/&mgr;m to not more than 0.2/&mgr;m .