Granted Patent
Utility
US 5,139,926 · App. 07/601,534
Permanent yellow imaged light modulating film
Inventor:
Kou-Chang Liu
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Oct 23, 1990
Inventor
Kou-Chang Liu
Assignee (at issue)
ISP INVESTMENTS LLC
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.