Granted Patent
Utility
US 6,521,907 · App. 09/556,210
Miniature photoelectric sensing chamber
Inventors:
Thomas W. Shoaff, Kalvin Watson, Dragan Petrovic, George A. Schoenfelder, Frederick J. Conforti, James F. Wiemeyer
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Apr 24, 2000
Inventors
Thomas W. Shoaff
Kalvin Watson
Dragan Petrovic
George A. Schoenfelder
Frederick J. Conforti
James F. Wiemeyer
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.