Granted Patent
Utility
US 4,955,050 · App. 07/331,298
System configuration of wireless PBX and communication method therefor
Inventor:
Yukiji Yamauchi
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Mar 31, 1989
Inventor
Yukiji Yamauchi
Assignee (at issue)
HITACHI, 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.