Granted Patent
Utility
US 5,202,608 · App. 07/675,165
Emergency lighting system utilizing improved and rapidly installable fluorescent inverter
Inventor:
James C. Johnson
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Mar 26, 1991
Inventor
James C. Johnson
Assignee (at issue)
National Service Industries, Inc.
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.