Electrophotography – Diagnostics – Consumable
Patent
1995-01-27
1998-03-24
Royer, William J.
Electrophotography
Diagnostics
Consumable
399 26, 399 27, G03G 1500
Patent
active
RE0357510
ABSTRACT:
A monitoring system for replaceable units, such as toner cartridges in an electrophotographic printer, includes on the unit an electronic count memory and an electronic flag memory. The count memory maintains a one-by-one count of prints made with the cartridge. The flag memory includes a series of bits which are alterable from a first state to a second state but not alterable from the second state to the first state. The bits in the flag memory are altered at predetermined intervals as prints are made with the cartridge. The flag memory is used as a check to override unauthorized manipulation of the count memory.
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Hutter R.
Royer William J.
Xerox Corporation
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