Granted Patent
Utility
US 5,682,140 · App. 08/651,221
Image forming device with end of life messaging for consumables
Inventors:
K. Trent Christensen, Douglas A. Cheney
Patented Case
View Patent ↗
Granted: Oct 28, 1997
Filed: May 22, 1996
Inventors
K. Trent Christensen
Douglas A. Cheney
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.