Granted Patent
Utility
US 4,218,528 · App. 05/913,668
Electrophotographic photoreceptor with phthalocyanine in phenol resin binder
Inventors:
Fumio Shimada, Masatoshi Matsuzaki, Masafumi Uehara
Patented Case
View Patent ↗
Granted: Aug 19, 1980
Filed: Jun 8, 1978
Inventors
Fumio Shimada
Masatoshi Matsuzaki
Masafumi Uehara
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.