Granted Patent
Utility
US 4,654,287 · App. 06/668,038
Insulated magnet toner
Inventors:
Yuji Okuyama, Kenichi Kishi, Kenzi Tuzita, Tsuyako Ban
Patented Case
View Patent ↗
Granted: Mar 31, 1987
Filed: Nov 5, 1984
Inventors
Yuji Okuyama
Kenichi Kishi
Kenzi Tuzita
Tsuyako Ban
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.