Granted Patent
Utility
US 6,501,225 · App. 09/923,037
Ballast with efficient filament preheating and lamp fault protection
Inventor:
John G. Konopka
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Aug 6, 2001
Inventor
John G. Konopka
Assignee (at issue)
OSRAM SYLVANIA 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.