Granted Patent
Utility
US 5,404,083 · App. 07/908,924
Energy-efficient cost-effective electronic ballast
Inventor:
Ole K. Nilssen
Patented Case
View Patent ↗
Granted: Apr 4, 1995
Filed: Jul 2, 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.