METHOD OF DETERMINING A CHARGING DEVICE PRE-FAULT STATUS, A PRINTING MACHINE ARRANGED WITH THE SAME METHOD, A METHOD OF FORMING A CHARGING DEVICE SERVICE MESSAGE AND A METHOD OF TRIGGERING A CLEANING CYCLE

Granted: Mar 23, 2004 Filed: Jun 16, 2003

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.