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. 10, 1994
Filed:
Feb. 22, 1993
Applicant:
Inventors:
Toshihiko Mori, Kawasaki, JP;
Naoki Yokoyama, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365179 ; 36518901 ; 365174 ;
Abstract
A semiconductor memory device comprises a memory cell transistor that includes two active parts each including therein an emitter and a base and showing a negative differential resistance. The collector layer is shared commonly by the two active parts and is connected to a bit line, while the emitters forming the two active parts are connected to respective word lines that form a word line pair. The bit line and the word lines forming the word line pair are biased to realize a bistable operational state in the memory cell transistor to hold the information.