Granted Patent
Utility
US 4,972,300 · App. 07/396,483
Emergency lighting device
Inventors:
David A. Beisswanger, Bruce H. Baretz, Edward T. Rockwell, Edward T. Rockwell, Sr.
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Aug 21, 1989
Inventors
David A. Beisswanger
Bruce H. Baretz
Edward T. Rockwell
Edward T. Rockwell, Sr.
Assignee (at issue)
American Cyanamid 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.