Granted Patent
Utility
US 4,488,049 · App. 06/319,444
Moving wall test device in optical smoke detectors
Inventor:
Angelo A. Marsocci
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Nov 9, 1981
Inventor
Angelo A. Marsocci
Assignee (at issue)
American District Telegraph Company
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.