Granted Patent
Utility
US 5,044,706 · App. 07/475,526
Optical element employing aspherical and binary grating optical surfaces
Inventor:
Chungte W. Chen
Patented Case
View Patent ↗
Granted: Sep 3, 1991
Filed: Feb 6, 1990
Inventor
Chungte W. Chen
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.