Granted Patent
Utility
US 6,639,241 · App. 10/073,030
Optical device using semiconductor
Inventors:
Kouji Nakahara, Tsurugi Sudo
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Feb 12, 2002
Inventors
Kouji Nakahara
Tsurugi Sudo
Assignee (at issue)
HITACHI, LTD.
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.