Granted Patent
Utility
US 6,822,257 · App. 10/248,553
Organic light emitting diode device with organic hole transporting material and phosphorescent material
Inventors:
Yung-Chih Lee, Wei-Su Chen, Chi-Chih Liao, Jiun-Haw Lee
Patented Case
View Patent ↗
Granted: Nov 23, 2004
Filed: Jan 29, 2003
Inventors
Yung-Chih Lee
Wei-Su Chen
Chi-Chih Liao
Jiun-Haw Lee
Assignee (at issue)
RITDISPLAY 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.