Granted Patent
Utility
US 4,903,321 · App. 07/085,663
Radio trunking fault detection system
Inventors:
Nancy L. Hall, David L. Hattey
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Aug 14, 1987
Inventors
Nancy L. Hall
David L. Hattey
Assignee (at issue)
General Electric 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.