Granted Patent
Utility
US 4,647,520 · App. 06/780,721
Electrophotographic photoreceptor containing an azo compound
Inventors:
Kazumasa Watanabe, Satoru Ikeuchi, Osamu Sasaki, Naohiro Hirose
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Sep 27, 1985
Inventors
Kazumasa Watanabe
Satoru Ikeuchi
Osamu Sasaki
Naohiro Hirose
Assignee (at issue)
Konoshiroku 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.