Appeal No. 1998-3281
Application 08/650,500
skilled with a sound working knowledge of chemistry, materials
science, physics and engineering. We are also satisfied that
said hypothetical person of ordinary skill would have been
motivated to use the well-known, commercially available family of
dispersant polymers known as DAPRAL's and, specifically, DAPRAL
GE 202, as the polymeric dispersant in any of Ohta, Matrick or Ma
because each of said references recognizes the suitability of
polymeric dispersants with hydrophobic and hydrophilic segments
in preparing ink jet ink compositions and DAPRAL's bear both
hydrophilic and hydrophobic moieties on the backbone of a
repeating segment. The motivation would also derive from the
polymer's well-understood mode of operation, that is, by
attachment of the hydrophobic segment to the pigment particle
with the hydrophilic segment attached thereto solubilizing the
pigment in aqueous solution. Still further, the routineer would
have reasonably expected the DAPRAL GE 202 to be useful in view
of the success reported in dispersing colloidal graphite or
carbon black in both Krüger and Xu. Moreover, Krüger
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