Granted Patent
Utility
US 6,445,637 · App. 09/815,802
Semiconductor memory device with a refresh function
Inventor:
Yasuhiro Nanba
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Mar 23, 2001
Inventor
Yasuhiro Nanba
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.