Granted Patent
Utility
US 6,649,939 · App. 10/070,584
Light-emitting diode with a structured surface
Inventor:
Ralph Wirth
Patented Case
View Patent ↗
Granted: Nov 18, 2003
Filed: Jun 25, 2002
Inventor
Ralph Wirth
Assignee (at issue)
OSRAM Opto Semiconductors GmbH
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.