Granted Patent
Utility
US 4,584,485 · App. 06/524,994
Optical block in smoke detectors
Inventors:
Robert B. Powers, Donald L. Adams, Angelo A. Marsocci
Patented Case
View Patent ↗
Granted: Apr 22, 1986
Filed: Aug 22, 1983
Inventors
Robert B. Powers
Donald L. Adams
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.