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:
Jul. 31, 2007
Filed:
Jun. 17, 2005
Noriaki Kodama, Kanagawa, JP;
Noriaki Kodama, Kanagawa, JP;
NEC Electronics Corporation, Kawasaki, JP;
Abstract
A nonvolatile semiconductor memory device includes a substrate, a central structure, a second gate insulating film, a floating gate, and a control gate. The substrate has a trench. The central structure is formed so as to be embedded in the trench and protruded from the substrate. The second gate insulating film is formed on the substrate so as to be contact with the central structure. The floating gate is formed on the second gate insulating film. The control gate is formed so as to cover the floating gate through a insulating film;. The central structure includes an assistant gate and a first gate insulating film which is formed such that the assistance gate is surrounded with the first gate insulating film. The floating gate is formed in a side wall shape on the side surface of the central structure.