Granted Patent
Utility
US 5,616,427 · App. 08/658,660
Organic thin film EL device having long lifetime
Inventor:
Hiroshi Tada
Patented Case
View Patent ↗
Granted: Apr 1, 1997
Filed: Jun 5, 1996
Inventor
Hiroshi Tada
Assignee (at issue)
NEC CORPORATION
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.