Granted Patent
Utility
US 4,904,903 · App. 07/177,693
Ballast for high intensity discharge lamps
Inventor:
David R. Pacholok
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Apr 5, 1988
Inventor
David R. Pacholok
Assignee (at issue)
Enovation Controls, LLC
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.