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:
Feb. 19, 1991
Filed:
Dec. 02, 1987
Applicant:
Inventors:
Yukio Takeuchi, Kawasaki, JP;
Satoshi Shinozaki, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 45 ; 357 235 ; 357 236 ; 357 41 ; 357 55 ; 357 90 ;
Abstract
A semiconductor memory device includes a memory cell array comprised of a plurality of memory cells each having a single transfer transistor and a single capacitor and a peripheral circuit including a plurality of drive transistors and adapted to drive the memory cell. The source and drain regions of the transfer transistor have an impurity concentration lower in level than that of the source and drain regions of the drive transistor.