Granted Patent
Utility
US 4,287,278 · App. 06/132,521
Two superimposed ion current formed images using photoconductive screen gives wider potential range for gradation control in electrophotography
Inventors:
Tatsuo Ohta, Sohji Shinozaki, Syusaku Yoshida, Hideo Ohba
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Mar 21, 1980
Inventors
Tatsuo Ohta
Sohji Shinozaki
Syusaku Yoshida
Hideo Ohba
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.