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. 12, 2015
Filed:
Aug. 08, 2013
Kabushiki Kaisha Toshiba, Minato-ku, Tokyo, JP;
Hiroki Tokuhira, Yokohama, JP;
Tsukasa Nakai, Hino, JP;
Hiroyoshi Tanimoto, Yokohama, JP;
Masaki Kondo, Kawasaki, JP;
Toshiyuki Enda, Zushi, JP;
Nobutoshi Aoki, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a nonvolatile semiconductor memory device comprises memory cells each which stores data with two or more levels. Each of the memory cells includes a semiconductor layer, a first insulating layer on the semiconductor layer, a charge storage layer on the first insulating layer, a second insulating layer on the charge storage layer, and a control gate electrode on the second insulating layer, and the second insulating layer includes a ferroelectric layer.