Granted Patent
Utility
US 5,198,721 · App. 07/690,587
Electroluminescent cell using a ZnS host including molecules of a ternary europium tetrafluoride compound
Inventors:
Dawon Kahng, Toshihiro Yoshioka
Patented Case
View Patent ↗
Granted: Mar 30, 1993
Filed: Feb 24, 1991
Inventors
Dawon Kahng
Toshihiro Yoshioka
Assignee (at issue)
NEC Research Institute, 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.