Granted Patent
Utility
US 4,335,378 · App. 05/971,510
Timed dual comparator alarm
Inventor:
Charles Coleman
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Dec 20, 1978
Inventor
Charles Coleman
Assignee (at issue)
Emerson Electric Co.
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.