Granted Patent
Utility
US 4,245,346 · App. 04/172,061
Communication system
Inventors:
Robert J. Grady, Harry G. Posthumus
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Feb 7, 1962
Inventors
Robert J. Grady
Harry G. Posthumus
Assignee (at issue)
Magnavox Government and Industrial Electronics Company
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.