Granted Patent
Utility
US 5,479,074 · App. 07/994,288
Electronic ballast with pre-conditioner circuit
Inventor:
Ole K. Nilssen
Patented Case
View Patent ↗
Granted: Dec 26, 1995
Filed: Dec 21, 1992
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.