Granted Patent
Utility
US 5,550,439 · App. 07/772,547
Electronic ballast having pulsating output voltage
Inventor:
Ole K. Nilssen
Patented Case
View Patent ↗
Granted: Aug 27, 1996
Filed: Oct 4, 1991
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.