Assignee
KATSUMATA RYOTA
JP9 patents
Top patents by PatentIndex Score
US8405142B2Mar 26, 2013
Semiconductor memory device
KATSUMATA RYOTA46 citations94
US8274108B2Sep 25, 2012
Nonvolatile semiconductor memory device and method for manufacturing the same
KATSUMATA RYOTA48 citations94
US8193571B2Jun 5, 2012
Stacked type nonvolatile semiconductor memory device and method of manufacturing same
KATSUMATA RYOTA29 citations92
US8154068B2Apr 10, 2012
Non-volatile semiconductor storage device and method of manufacturing the same
KATSUMATA RYOTA35 citations92
US8218358B2Jul 10, 2012
Nonvolatile semiconductor memory device and method for driving same
KATSUMATA RYOTA8 citations84
US8189371B2May 29, 2012
Nonvolatile semiconductor memory device and method for driving same
KATSUMATA RYOTA18 citations84
US8120961B2Feb 21, 2012
Nonvolatile semiconductor memory device
KATSUMATA RYOTA17 citations84
US8294191B2Oct 23, 2012
Multi-layer memory device including vertical and U-shape charge storage regions
KATSUMATA RYOTA6 citations73
US8541866B2Sep 24, 2013
Nonvolatile semiconductor memory device and method for manufacturing same
KATSUMATA RYOTA2 citations63