Granted Patent
Utility
US 4,415,640 · App. 06/350,039
Electrophotographic element with fluorenylidene hydrazone compounds
Inventors:
Satoshi Goto, Kiyoshi Sawada, Osamu Sasaki, Akira Kinoshita, Yoshiaki Takei, Yoshihide Fujimaki
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Feb 18, 1982
Inventors
Satoshi Goto
Kiyoshi Sawada
Osamu Sasaki
Akira Kinoshita
Yoshiaki Takei
Yoshihide Fujimaki
Assignee (at issue)
Konishiroku Photo Industry Co., 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.