Granted Patent
Utility
US 4,449,142 · App. 06/230,460
Semiconductor memory device
Inventors:
Toshiaki Tsuchiya, Manabu Itsumi
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Feb 2, 1981
Inventors
Toshiaki Tsuchiya
Manabu Itsumi
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.