Granted Patent
Utility
US 5,469,028 · App. 07/901,989
Electronic ballast drawing sinusoidal line current
Inventor:
Ole K. Nilssen
Patented Case
View Patent ↗
Granted: Nov 21, 1995
Filed: Jun 22, 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.