Granted Patent
Utility
US 5,710,489 · App. 08/348,327
Overvoltage and thermally protected electronic ballast
Inventor:
Ole K. Nilssen
Patented Case
View Patent ↗
Granted: Jan 20, 1998
Filed: Dec 2, 1994
Inventor
Ole K. Nilssen
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.