Granted Patent
Utility
US 4,715,684 · App. 06/622,528
Optical system for three color liquid crystal light valve image projection system
Inventor:
Ralph J. Gagnon
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: Jun 20, 1984
Inventor
Ralph J. Gagnon
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.