Granted Patent
Utility
US 4,138,670 · App. 05/756,494
A.C. powered detecting device with battery backup
Inventors:
Quentin L. Schneider, Richard J. Schwarzbach
Patented Case
View Patent ↗
Granted: Feb 6, 1979
Filed: Jan 3, 1977
Inventors
Quentin L. Schneider
Richard J. Schwarzbach
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.