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. 05, 2011
Filed:
Jun. 21, 2007
Applicant:
Tsutomu Hayakawa, Tokyo, JP;
Inventor:
Tsutomu Hayakawa, Tokyo, JP;
Assignee:
Elpida Memory, Inc., Chuo-ku, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 47/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor memory device comprises a heater electrode, a phase change portion, a heat insulation portion and an upper electrode. The phase change portion comprises a concave portion and a contact portion. The concave portion is in contact with the heater electrode. The contact portion is formed integrally with the concave portion. The heat insulation portion is formed in the concave portion. The upper electrode is formed on the contact portion and the heat insulation portion so that the heat insulation portion is positioned between the concave portion and the upper electrode.