Granted Patent
Utility
US 5,644,151 · App. 08/453,975
Semiconductor memory device and method for fabricating the same
Inventors:
Hirohiko Izumi, Shoichi Iwasa
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: May 30, 1995
Inventors
Hirohiko Izumi
Shoichi Iwasa
Assignee (at issue)
NIPPON STEEL 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.