Granted Patent
Utility
US 5,446,347 · App. 07/851,495
Electronic ballast with special DC supply
Inventor:
Ole K. Nilssen
Patented Case
View Patent ↗
Granted: Aug 29, 1995
Filed: Mar 16, 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.