US Patent 7538377 Semiconductor memory device

Patent 7538377 was granted and assigned to Elpida Memory on May, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Elpida Memory

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7538377

Date of Patent

May 26, 2009

Patent Application Number

11353257

Date Filed

February 14, 2006

Patent Primary Examiner

‌

M. Wilczewski

Patent abstract

In a cell contact pad method, a consecutive dummy cell contact pad intersecting with a cell gate electrode is formed at an outer peripheral portion of the memory cell array. The dummy cell contact pad blocks liquid and gas to intrude through a void, and prevents the cell contact pad from being decayed and having high resistivity.