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. 15, 2014
Filed:
Sep. 07, 2011
Hiroyuki Kutsukake, Yokohama, JP;
Yoshiko Kato, Yokohama, JP;
Hiroyuki Kutsukake, Yokohama, JP;
Yoshiko Kato, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In one embodiment, a semiconductor memory device includes a substrate, and device regions in the substrate to extend in a first direction. The device further includes select gates on the substrate to extend in a second direction, and a contact region provided between the select gates and including contact plugs on the respective device regions. The contact region includes partial regions, in each of which N contact plugs are disposed on N successive device regions to be arranged on a straight line being non-parallel to the first and second directions, where N is an integer of 2 or more. The contact region includes the partial regions of at least two types whose values of N are different. Further, each of the contact plugs has a planar shape of an ellipse, and is arranged so that a major axis of the ellipse is tilted with respect to the first direction.