Granted Patent
Utility
US 4,292,922 · App. 06/122,769
Developing device for an electrophotographic copying machine
Inventors:
Yoshio Yamazaki, Nin-ichi Kamogawa, Yasuyuki Iwai
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Feb 19, 1980
Inventors
Yoshio Yamazaki
Nin-ichi Kamogawa
Yasuyuki Iwai
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.