Granted Patent
Utility
US 5,289,428 · App. 07/972,913
Semiconductor memory device
Inventors:
Katsuyuki Sato, Miki Matsumoto, Sadayuki Ohkuma, Masahiro Ogata, Masahiro Yoshida
Patented Case
View Patent ↗
Granted: Feb 22, 1994
Filed: Nov 6, 1992
Inventors
Katsuyuki Sato
Miki Matsumoto
Sadayuki Ohkuma
Masahiro Ogata
Masahiro Yoshida
Assignee (at issue)
Hitachi, Ltd. and Hitachi VLSI Engineering Corp.
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.