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. 09, 1978
Filed:
Dec. 15, 1975
Applicant:
Inventor:
Tomoyuki Tanaka, Hitachi, JA;
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 38 ; 357 39 ; 357 51 ; 357 55 ; 357 64 ; 357 86 ;
Abstract
A semiconductor switching device including at least three PN junctions and a control electrode formed on a portion of the surface of one outermost layer out of the layers constituting said PN junctions, wherein, in order to positively ensure that it turns off, the forward voltage drop across a current path including a portion of the outermost layer near the control electrode is made greater than that across the main current path.