Granted Patent
Utility
US 4,873,672 · App. 07/051,715
Dynamic random access memory capable of fast erasing of storage data
Inventors:
Jun Etoh, Katsuhiro Shimohigashi, Kazuyuki Miyazawa, Katsutaka Kimura, Takesada Akiba
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: May 20, 1987
Inventors
Jun Etoh
Katsuhiro Shimohigashi
Kazuyuki Miyazawa
Katsutaka Kimura
Takesada Akiba
Assignees (at issue)
HITACHI, LTD.
Hitachi Device Engineering Co., 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.