Granted Patent
Utility
US 6,830,836 · App. 10/671,406
Heterocyclic compounds, materials for light emitting devices and light emitting devices using the same
Inventors:
Hisashi Okada, Toshihiro Ise
Patented Case
View Patent ↗
Granted: Dec 14, 2004
Filed: Sep 26, 2003
Inventors
Hisashi Okada
Toshihiro Ise
Assignee (at issue)
Fujitsu Limited
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.