Granted Patent
Utility
US 5,243,455 · App. 07/884,644
Chiral smectic liquid crystal polarization interference filters
Inventors:
Kristina M. Johnson, Gary D. Sharp
Patented Case
View Patent ↗
Granted: Sep 7, 1993
Filed: May 15, 1992
Inventors
Kristina M. Johnson
Gary D. Sharp
Assignee (at issue)
The Regents of the University of Colorado
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.