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:
Dec. 30, 2014
Filed:
Jul. 11, 2013
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Yoshiko Kato, Kanagawa-ken, JP;
Tatsuya Kato, Mie-ken, JP;
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Abstract
According to one embodiment, a semiconductor memory device includes a semiconductor substrate, a cell transistor, an extraction section, a guard ring, a first transistor, and a second transistor. The semiconductor substrate includes first, second, third, and fourth regions. The fourth region includes first and second portions. The cell transistor is provided on the first region and includes a first insulating film, a charge storage film, and a first electrode. The extraction section is provided on the second region and includes a second insulating film, and an extension electrode. The guard ring is provided on the third region and includes a third insulating. The first transistor is provided on the first portion and includes a fourth insulating, and a second electrode. The second transistor is provided on the second portion and includes a fifth insulating film, and a third electrode.