Granted Patent
Utility
US 6,501,891 · App. 09/911,574
Optical wave-guide, light-beam spot converter and optical transmission module
Inventors:
Kazumi Kawamoto, Hiroaki Furuichi
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Jul 25, 2001
Inventors
Kazumi Kawamoto
Hiroaki Furuichi
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.