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:
Apr. 24, 1990
Filed:
Feb. 25, 1988
Applicant:
Inventors:
Ichio Shimizu, Tamamura, JP;
Akio Hoshi, Isesaki, JP;
Sumio Okada, Takasaki, JP;
Soichiro Nakamura, Tokyo, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
437211 ; 437220 ; 437217 ; 437219 ; 29856 ; 361421 ; 357 70 ; 357 72 ; 357 74 ;
Abstract
The present invention provides a surface mount Gull-Wing type resin-encapsulating package for encapsulating a semiconductor chip, wherein the cut face (outer tip end) of each outer lead is formed to have a smaller cross-sectional area than that of each outer lead, for improving the extension of solder to the cut face of that lead. Such relatively smaller cross-sectional area of the outer tip end of each outer lead reduces the exposed area of the lead material when disconnecting the leads from the frame in separating the device from the frame.