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:
Jun. 25, 2002
Filed:
Aug. 10, 1999
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 2/334 ; H01L 2/348 ; H01L 2/352 ; H01L 2/940 ;
U.S. Cl.
CPC ...
H01L 2/334 ; H01L 2/348 ; H01L 2/352 ; H01L 2/940 ;
Abstract
A semiconductor device in which fatigue failure of a solder layer underneath a semiconductor chip mounted on a base can be prevented from occurring due to repetitions of turn-on and -off of power during operation thereof, is provided, that is, a recess is formed in the base in a part underneath the semiconductor chip so as to prevent occurrence of thermal expansion in the base.