Granted Patent
Utility
US 4,842,374 · App. 07/248,464
Unitary prepolarizing prism assembly for a four color liquid crystal light valve image projector
Inventor:
Arno G. Ledebuhr
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Sep 23, 1988
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.