Granted Patent
Utility
US 5,142,573 · App. 07/650,204
Telephone apparatus for radio communication with an adaptor
Inventor:
Masaaki Umezawa
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Feb 4, 1991
Inventor
Masaaki Umezawa
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.