Granted Patent
Utility
US 4,464,018 · App. 06/334,676
Liquid crystal light valve image projection system with color selective prepolarization and blue mirror
Inventor:
Ralph J. Gagnon
Patented Case
View Patent ↗
Granted: Aug 7, 1984
Filed: Dec 28, 1981
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.