Granted Patent
Utility
US 4,430,646 · App. 06/221,524
Forward scatter smoke detector
Inventor:
Robert B. Enemark
Patented Case
View Patent ↗
Granted: Feb 7, 1984
Filed: Dec 31, 1980
Inventor
Robert B. Enemark
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.