Granted Patent
Utility
US 5,994,847 · App. 08/792,364
Electronic ballast with lamp current valley-fill power factor correction
Inventor:
John G. Konopka
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: Jan 31, 1997
Inventor
John G. Konopka
Assignee (at issue)
Motorola, Inc.
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.