Granted Patent
Utility
US 5,341,067 · App. 08/046,171
Electronic ballast with trapezoidal voltage waveform
Inventor:
Ole K. Nilssen
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: Apr 27, 1993
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.