Granted Patent
Utility
US 5,166,972 · App. 07/426,418
Group emergency call system
Inventor:
Dawn Smith
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Oct 26, 1989
Inventor
Dawn Smith
Assignee (at issue)
Mitel 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.