Granted Patent
Utility
US 5,422,623 · App. 08/102,690
Programmable emergency signalling device and system
Inventors:
Joseph F. Bader, Ward Gieffers, Michael Benner, Kent A. Kekeis, Dennis Hilburger
Patented Case
View Patent ↗
Granted: Jun 6, 1995
Filed: Aug 5, 1993
Inventors
Joseph F. Bader
Ward Gieffers
Michael Benner
Kent A. Kekeis
Dennis Hilburger
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.