Granted Patent
Utility
US 5,170,250 · App. 07/651,672
Full-color light valve projection apparatus having internal image registration system
Inventor:
Arno G. Ledebuhr
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Feb 6, 1991
Inventor
Arno G. Ledebuhr
Assignee (at issue)
Hughes Aircraft Company
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.