Granted Patent
Utility
US 4,499,453 · App. 06/591,889
Power saver circuit for audio/visual signal unit
Inventor:
Robert W. Right
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: Mar 21, 1984
Inventor
Robert W. Right
Assignee (at issue)
Federal Signal 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.