Granted Patent
Utility
US 6,790,540 · App. 10/258,533
Organic electroluminescent element material and organic electroluminescent element
Inventors:
Tatsuo Mori, Teruyoshi Mizutani, Toru Takeda, Hiroshi Miyazaki, Koichi Yamashita
Patented Case
View Patent ↗
Granted: Sep 14, 2004
Filed: Oct 25, 2002
Inventors
Tatsuo Mori
Teruyoshi Mizutani
Toru Takeda
Hiroshi Miyazaki
Koichi Yamashita
Assignees (at issue)
NIPPON STEEL CHEMICAL CO., LTD.
Tatsuo Mori
Teruyoshi Mizutani
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.