Granted Patent
Utility
US 4,890,332 · App. 07/223,117
Apparatus for judging quality of mobile data communication
Inventor:
Chusei Takahashi
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Jun 27, 1988
Inventor
Chusei Takahashi
Assignee (at issue)
OKI ELECTRIC INDUSTRY 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.