Granted Patent
Utility
US 6,239,556 · App. 09/464,007
Long life discharge lamp operating circuit with reduced lamp flicker
Inventors:
Gunther Hans Derra, Hanns E. Fischer, Hans G. Ganser, Thomas Krücken, Holger Moench, Rob Snijkers
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Dec 15, 1999
Inventors
Gunther Hans Derra
Hanns E. Fischer
Hans G. Ganser
Thomas Krücken
Holger Moench
Rob Snijkers
Assignee (at issue)
U.S. Philips Corporation
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.