Granted Patent
Utility
US 4,807,978 · App. 07/096,093
Color display device and method using holographic lenses
Inventors:
Jan Grinberg, Ronald T. Smith
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Sep 10, 1987
Inventors
Jan Grinberg
Ronald T. Smith
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.