Granted Patent
Utility
US 6,656,612 · App. 10/224,377
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 2, 2003
Filed: Aug 21, 2002
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.