Granted Patent
Utility
US 5,710,488 · App. 07/859,616
Low-frequency high-efficacy electronic ballast
Inventor:
Ole K. Nilssen
Patented Case
View Patent ↗
Granted: Jan 20, 1998
Filed: Mar 23, 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.