Granted Patent
Utility
US 4,138,664 · App. 05/751,021
Warning device
Inventors:
Frederick J. Conforti, Richard J. Schwarzbach, Quentin L. Schneider
Patented Case
View Patent ↗
Granted: Feb 6, 1979
Filed: Dec 14, 1976
Inventors
Frederick J. Conforti
Richard J. Schwarzbach
Quentin L. Schneider
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.