Granted Patent
Utility
US 4,477,800 · App. 06/328,304
Security system
Inventor:
Thomas Edward O'Brien
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Dec 7, 1981
Inventor
Thomas Edward O'Brien
Assignee (at issue)
General Instrument 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.