Electrophotography – Diagnostics – Consumable
Reexamination Certificate
2011-07-19
2011-07-19
Gray, David M (Department: 2852)
Electrophotography
Diagnostics
Consumable
C399S027000, C399S012000
Reexamination Certificate
active
07983574
ABSTRACT:
A method and system compare actual consumable usage (e.g., toner usage) with expected consumable usage in a xerographic machine, such as a printer or copier. Expected toner usage may be predicted from pixel count (area coverage) and actual usage is obtained from monitoring of consumable usage, such as from toner dispense data or toner bottle replacements. If the actual toner usage differs significantly from the expected toner usage (e.g., ±40%), the system may take some action, such as scheduling of a service call. Early detection of abnormal consumable usage in a xerographic machine may allow early correction before any noticeable image defects occur, such as images that are too light or too dark.
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Gray David M
Oliff & Berridg,e PLC
Xerox Corporation
Yi Roy
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