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:
Feb. 22, 1994
Filed:
Oct. 29, 1991
Tomoharu Mametani, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A are a semiconductor memory device excellent memory characteristics of which can be obtained without deteriorating a characteristic of a transistor for use in a peripheral circuit even when a memory cell array region and a peripheral circuit region differ from each other in wiring pattern density and a manufacturing method therefor. The semiconductor memory device includes a dummy pattern formed between and at predetermined distance from gate electrodes of a transfer gate transistor in the peripheral circuit region. As a result, precision in dimension of the gate electrode in the peripheral circuit portion is improved to achieve excellent memory characteristics without deteriorating the transistor