Granted Patent
Utility
US 6,687,039 · App. 09/941,651
Optical modulator
Inventor:
Masataka Shirai
Patented Case
View Patent ↗
Granted: Feb 3, 2004
Filed: Aug 30, 2001
Inventor
Masataka Shirai
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.