Granted Patent
Utility
US 4,427,974 · App. 06/409,181
Local control apparatus for central station alarm system
Inventor:
Robert F. Sheahan
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Aug 18, 1982
Inventor
Robert F. Sheahan
Assignee (at issue)
American District Telegraph Company
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.