Granted Patent
Utility
US 4,836,649 · App. 06/754,799
Optical layout for a three light valve full-color projector employing a dual relay lens system and a single projection lens
Inventors:
Arno G. Ledebuhr, Donald E. Sprothbery
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Jul 19, 1985
Inventors
Arno G. Ledebuhr
Donald E. Sprothbery
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.