Granted Patent
Utility
US 6,301,154 · App. 09/497,318
Semiconductor memory device having floating gate type transistors programmed to have differing threshold voltages
Inventor:
Ken Sumitani
Patented Case
View Patent ↗
Granted: Oct 9, 2001
Filed: Feb 3, 2000
Inventor
Ken Sumitani
Assignee (at issue)
SHARP KABUSHIKI KAISHA
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.