Inventor
KUNITOU MASAO
JP6 patents
Patents
6 patentsUS6221723B1Apr 24, 2001
Method of setting threshold voltage levels of a multiple-valued mask programmable read only memory
NEC CORP56 citations93
US5470774ANov 28, 1995
Fabrication method of a read-only semiconductor memory device
NEC CORP20 citations81
US5854110ADec 29, 1998
Process fabricating semiconductor device having two ion-implantations carried out by using a shared photo-resist mask
NEC CORP7 citations71
US5538917AJul 23, 1996
Fabrication method of semiconductor integrated circuit device
NEC CORP12 citations71
US6479874B2Nov 12, 2002
Semiconductor memory device having multilevel memory cell and method of manufacturing the same
NEC CORP2 citations61
US5960287ASep 28, 1999
Method for manufacturing semiconductor memory devices having a ROM device
NEC CORP6 citations60