Granted Patent
Utility
US 6,322,909 · App. 09/337,608
Organic electroluminescent device comprising a squarylium compound
Inventor:
Yoshikazu Sakaguchi
Patented Case
View Patent ↗
Granted: Nov 27, 2001
Filed: Jun 21, 1999
Inventor
Yoshikazu Sakaguchi
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.