Granted Patent
Utility
US 5,111,321 · App. 07/677,769
Dual-polarization liquid-crystal etalon filter
Inventor:
Jayantilal S. Patel
Patented Case
View Patent ↗
Granted: May 5, 1992
Filed: Mar 29, 1991
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.