Granted Patent
Utility
US 4,173,742 · App. 05/878,131
Antenna isolation device
Inventor:
William L. Lehmann
Patented Case
View Patent ↗
Granted: Nov 6, 1979
Filed: Feb 15, 1978
Inventor
William L. Lehmann
Assignee (at issue)
RCA 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.