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:
Dec. 28, 1999
Filed:
Feb. 10, 1998
Applicant:
Inventors:
Hiromu Shiomi, Hyogo, JP;
Yoshiaki Kumazawa, Hyogo, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B44C / ; H01L / ; H01L / ;
U.S. Cl.
CPC ...
216 17 ; 216 41 ; 216 51 ; 216 56 ; 216 65 ; 216 67 ; 216 81 ; 257706 ; 257712 ; 257930 ; 438105 ; 252 70 ;
Abstract
A diamond polycrystal body having metal films on its upper and lower surfaces is cut in the vertical direction using a laser to form a diamond polycrystal body piece having upper and lower surfaces and a cut surface connecting the upper and lower surfaces. The cut surface may be damaged and include graphite resulting from the laser cutting. To remove the damage and the graphite, the cut surface of the diamond polycrystal body piece is then plasma-treated. Thereby a prescribed degree of electrical insulation between the metallized upper and lower surfaces can be ensured.