Granted Patent
Utility
US 4,425,028 · App. 06/334,682
High efficiency optical tank for three color liquid crystal light valve image projection with color selective prepolarization and single projection lens
Inventors:
Ralph J. Gagnon, Robert T. Carson
Patented Case
View Patent ↗
Granted: Jan 10, 1984
Filed: Dec 28, 1981
Inventors
Ralph J. Gagnon
Robert T. Carson
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.