Appeal No. 2001-1773
Application No. 08/732,864 Page 11
employs the drop volume coefficients, drop count and temperature
measurements to estimate ink usage (col. 8, lines 40-42).
From the disclosure of Bullock, we agree with appellants
that Bullock does not disclose either "an inkjet printhead
mounted to the pen body" or "identifying said corresponding
actual drop weight for said printhead" as required by claim 1.
Although we find that Bullock discloses estimating the drop
volume to determine the amount of ink remaining in the cartridge,
we find no teaching or suggestion of identifying the actual drop
weight.
Watrobski is directed to a control system for a thermal ink
jet printer (col. 1, lines 11 and 12). Watrobski recognizes the
importance of having uniform spot size from each of the ejectors
(col. 1, lines 62-67), and discloses an electronically readable
medium capable of storing a value having a symbolic relationship
to a performance characteristic of the printhead (col. 2, lines
65-67). Figure 6 is a prior art view of a linear array of 128
ejectors spaced 300 to the inch. The silicon module defining the
128 ejectors is known as a chip (col. 3, lines 38-46). On one
portion of chip 50 are sense pads 60a and 60b, which are provided
as terminals. Between the sense pads is an area of resistivity
62 which provides a desired resistance between the sense pads.
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