Granted Patent
Utility
US 4,539,556 · App. 06/485,234
Combustion products detector with accelerated test
Inventors:
Stanley S. Dederich, George A. Schoenfelder, William M. Koster
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Apr 15, 1983
Inventors
Stanley S. Dederich
George A. Schoenfelder
William M. Koster
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.