Granted Patent
Utility
US 4,562,131 · App. 06/607,200
Photoreceptor containing a trisazo compound for use in electrophotography
Inventors:
Osamu Sasaki, Naohiro Hirose, Kiyoshi Sawada
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: May 4, 1984
Inventors
Osamu Sasaki
Naohiro Hirose
Kiyoshi Sawada
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.