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:
Sep. 04, 1990
Filed:
Aug. 12, 1988
Applicant:
Inventor:
Takeshi Kasahara, Saitama, JP;
Assignee:
Toko, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 14 ; 357 89 ; 357 90 ;
Abstract
In a variable-capacitance diode device consisting of a PN junction, and a semiconductor layer of a first conductivity type, the impurity concentration of which decreases as the depth from the PN junction increases, the semiconductor layer of the first conductivity type is arranged to include, except in the vicinity of the PN junction, at least one such point that the following relationship holds true: