Granted Patent
Utility
US 6,226,198 · App. 09/472,178
Nonvolatile memory device and refreshing method
Inventors:
Hitoshi Miwa, Hiroaki Kotani
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Dec 27, 1999
Inventors
Hitoshi Miwa
Hiroaki Kotani
Assignee (at issue)
HITACHI, LTD.
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.