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. 02, 1996
Filed:
Apr. 11, 1995
Applicant:
Inventors:
Kenichiro Kohmoto, Itami, JP;
Mitsuo Osada, Sakata, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
257712 ; 257720 ; 257747 ; 165 802 ; 361708 ; 361709 ; 361717 ;
Abstract
A semiconductor-mounting heat-sink base for use with a plastic package or flexible printed wiring board which eliminates the possibility of semiconductor or package reliability being adversely affected due to a difference in thermal expansion coefficient between the heat sink base and the semiconductor or plastic package. The heat-sink base has a semiconductor-mounting portion comprising a Cu--W or Cu--Mo composite alloy containing 5 to 25 wt. % of copper made by an infiltration process, and a portion adjacent to a plastic package which comprises a copper or copper alloy containing not less than 95% of copper.