System for estimating the remaining life of a print cartridge

Electrophotography – Remote monitoring

Reexamination Certificate

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C399S027000

Reexamination Certificate

active

06792216

ABSTRACT:

BACKGROUND
Many printing devices make use of a replaceable print cartridge. The cartridge typically contains a print material (e.g., toner or ink) that is consumed during a printing operation.
There have been efforts in the past to develop systems that monitor the remaining life of a print cartridge in a printing device. Ways are needed, however, to improve these systems.
It is noted for the later discussion that the “remaining life” of a print cartridge refers to the present capacity of the cartridge to print additional pages. One way, for example, the remaining life of a cartridge may be expressed is as a percentage of the original capacity.
For example, if none of the original amount of print material in a cartridge has been consumed, the remaining life of the cartridge may be said to be at “100%”. If 50% of the original print material is consumed, the remaining life of the cartridge may be said to be at “50%”.


REFERENCES:
patent: 5794094 (1998-08-01), Boockholdt et al.
patent: 6456802 (2002-09-01), Phillips
patent: 6510292 (2003-01-01), Owen et al.
patent: 6584291 (2003-06-01), Yamamoto

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