Granted Patent
Utility
US 4,840,447 · App. 07/095,616
Light modulating device array
Inventor:
Keiji Kataoka
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Sep 10, 1987
Inventor
Keiji Kataoka
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.