Granted Patent
Utility
US 5,814,971 · App. 08/998,582
Emergency florescent inverter for magnetic and electronic ballasts
Inventor:
James C. Johnson
Patented Case
View Patent ↗
Granted: Sep 29, 1998
Filed: Dec 29, 1997
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.