Granted Patent
Utility
US 5,658,490 · App. 08/419,593
Liquid crystal achromatic compound retarder
Inventors:
Gary D. Sharp, Kristina M. Johnson
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Apr 7, 1995
Inventors
Gary D. Sharp
Kristina M. Johnson
Assignee (at issue)
The Board of 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.