Granted Patent
Utility
US 4,280,123 · App. 06/146,913
Multitone signaling device
Inventors:
Robert W. Right, Herbert W. McCord, Vaclav O. Podany
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: May 5, 1980
Inventors
Robert W. Right
Herbert W. McCord
Vaclav O. Podany
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.