Granted Patent
Utility
US 4,134,068 · App. 05/777,661
Transmitter/receivers
Inventor:
Christopher K. Richardson
Patented Case
View Patent ↗
Granted: Jan 9, 1979
Filed: Mar 15, 1977
Inventor
Christopher K. Richardson
Assignee (at issue)
Plessey Handel Und Investments AG
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.