Granted Patent
Utility
US 5,162,848 · App. 07/654,892
Toner empty detecting system
Inventors:
Susumu Saitoh, Nobuo Ihata, Kazuyuki Ono
Patented Case
View Patent ↗
Granted: Nov 10, 1992
Filed: Feb 13, 1991
Inventors
Susumu Saitoh
Nobuo Ihata
Kazuyuki Ono
Assignee (at issue)
Hitachi Koki 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.