Granted Patent
Utility
US 6,151,237 · App. 09/292,665
DRAM having each memory cell storing plural bit data
Inventor:
Isao Naritake
Patented Case
View Patent ↗
Granted: Nov 21, 2000
Filed: Apr 16, 1999
Inventor
Isao Naritake
Assignee (at issue)
NEC CORPORATION
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.