Semiconductor memory device and manufacturing method for the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 4, 2007
Grant Date -
Oct 13, 2005
app pub date -
Mar 16, 2005
filing date -
Mar 17, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a semiconductor memory device including: a semiconductor substrate of a first conductivity type; and a memory cell including: (i) a columnar semiconductor portion formed on the substrate, (ii) at least two charge-storage layers formed around a periphery of the columnar semiconductor portion and divided in a direction vertical to the semiconductor substrate, and (iii) a control gate that covers at least a portion of charge-storage layers, wherein the memory cell is capable of holding two-bit or more data.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully