Granted Patent
Utility
US 4,451,134 · App. 06/447,883
Magnetic-brush developing device
Inventors:
Masakazu Fukuchi, Keiji Oishi, Yoshio Yamazaki
Patented Case
View Patent ↗
Granted: May 29, 1984
Filed: Dec 8, 1982
Inventors
Masakazu Fukuchi
Keiji Oishi
Yoshio Yamazaki
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.