Granted Patent
Utility
US 6,833,667 · App. 10/373,210
Organic electroluminescence element and image forming apparatus or portable terminal unit using thereof
Inventors:
Takafumi HAMANO, Hisanori Sugiura, Naohide Wakita, Hiroshi Yamaguchi, Tomohiko Sasano, Yasuhiro Tanaka
Patented Case
View Patent ↗
Granted: Dec 21, 2004
Filed: Feb 26, 2003
Inventors
Takafumi HAMANO
Hisanori Sugiura
Naohide Wakita
Hiroshi Yamaguchi
Tomohiko Sasano
Yasuhiro Tanaka
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, LTD.
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.