Appeal No. 1999-1889 Page 2
Application No. 08/366,988
cartridge is connected to the print head of a printing machine
to supply ink to the machine’s print head to enable it to
print characters or images. The ink is held in the container
by a vacuum producing material therein. When the ink in the
cartridge has been consumed, the cartridge is replaced.
Accordingly, the useful life of a cartridge is determined by
subtracting the volume of ink remaining in the foam material
after use from the volume of ink stored in the cartridge
before use.
The appellants’ ink jet cartridge uses foam (or foam
pads) of two densities. The lower density foam is distant an
opening through which the cartridge is connected to a print
head. Its lower density enables the foam to store a great
volume of ink and release the ink to the higher density foam,
which is between the lower density foam and the opening. The
higher density foam controls the rate that ink flows to the
print head unit and creates a high vacuum pressure to prevent
ink from leaking through the opening.
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Last modified: November 3, 2007