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:
Jun. 05, 2001
Filed:
Jul. 10, 2000
Applicant:
Inventors:
Shinichi Kobayashi, Hyogo, JP;
Yoshikazu Miyawaki, Hyogo, JP;
Shinji Kawai, Hyogo, JP;
Tomoshi Futatsuya, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/00 ;
U.S. Cl.
CPC ...
G11C 7/00 ;
Abstract
A memory cell array is divided into a plurality of memory cell blocks each collectively subjected to an erasing operation as a unit. A P well regions for memory cell transistors and an N well region for electrically separating the P well regions are provided. Select transistors are formed in the same P well region as the memory cell transistor connected to the corresponding sub bit line of P well regions.