Granted Patent
Utility
US 6,023,317 · App. 09/052,001
Normally white twisted nematic LCD with positive and negative retarders
Inventors:
Gang Xu, John A. VanderPloeg
Patented Case
View Patent ↗
Granted: Feb 8, 2000
Filed: Mar 31, 1998
Inventors
Gang Xu
John A. VanderPloeg
Assignee (at issue)
OIS Optical Imaging Systems, 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.