Granted Patent
Utility
US 4,604,606 · App. 06/763,775
Audio signalling device
Inventor:
Louis P. Sweany
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Aug 8, 1985
Inventor
Louis P. Sweany
Assignee (at issue)
Emhart Industries, Inc.
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.