Granted Patent
Utility
US 4,826,311 · App. 07/110,068
Prism assembly with three periscopes and projection lenses for a single light valve full-color projector
Inventor:
Arno G. Ledebuhr
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Oct 15, 1987
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.