Granted Patent
Utility
US 5,267,234 · App. 07/645,970
Radio transceiver with duplex and notch filter
Inventor:
Peter Harrison
Patented Case
View Patent ↗
Granted: Nov 30, 1993
Filed: Jan 24, 1991
Inventor
Peter Harrison
Assignee (at issue)
Technophone Limited
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.