Granted Patent
Utility
US 4,287,517 · App. 06/115,606
Circuit for eliminating low battery voltage alarm signal at night
Inventor:
Richard A. Nagel
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Jan 25, 1980
Inventor
Richard A. Nagel
Assignee (at issue)
Pittway 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.