Granted Patent
Utility
US 5,069,813 · App. 07/626,205
Electrically controlled polarization-independent liquid crystal fresnel lens
Inventor:
Jayantilal S. Patel
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: Dec 10, 1990
Inventor
Jayantilal S. Patel
Assignee (at issue)
Bell Communications Research, Inc.
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.