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:
Aug. 26, 1980
Filed:
Aug. 20, 1976
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 38 ; 357 30 ; 357 59 ; 357 86 ; 357 89 ; 357 90 ;
Abstract
A thyristor comprising a four-layer semiconductor substrate of PNPN structure in which the sum of the thicknesses in the layered direction of the intermediate P-type and N-type layers is less than 400.mu., and the amount of impurities per unit area of either one of the outer P-type and N-type layers is less than 3.times.10.sup.14 atoms/cm.sup.2.