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:
Apr. 03, 2012
Filed:
Oct. 23, 2007
Masayuki Terai, Tokyo, JP;
Shinji Fujieda, Tokyo, JP;
Akio Toda, Tokyo, JP;
Renesas Electronics Corporation, Kanagawa, JP;
Abstract
A channel is formed at a recessed portion or a projecting portion of a substrate, and a gate insulating film is formed so as to have first to third insulating regions along the channel. Each of the gate insulating films of the first and third insulating regions has a first gate insulating film containing no electric charge trap formed on a plane different from a principal surface of the substrate, an electric charge accumulating film containing an electric charge trap, and a second gate insulating film containing no electric charge trap. The gate insulating film of the second insulating region at the middle is formed on a plane parallel to the principal surface of the substrate and is composed of only a third gate insulating film containing no electric charge trap.