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:
Nov. 25, 1997
Filed:
Nov. 18, 1996
Takahisa Eimori, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a semiconductor memory device, pitch of bit lines is made larger than pitch of word lines, and a storage node contact is positioned in each rectangular area surrounded by the bit lines and the word lines. The distance between centers of adjacent storage node contacts and the distance between centers of a bit line contact and an adjacent storage node contact are both made larger than the pitch of word lines. By this structure, planar area per unit memory cell can be increased, registration margin between the storage node and the storage node contact can be enlarged, short-circuit between the bit line and the storage node contact is prevented, and thus a memory cell structure of high production yield and high reliability can be realized.