Appeal No. 1998-3217
Application No. 08/536,236
to nothing more than routine experimentation to determine the
surface tension and viscosity for the ink that is suitable for
ink jet printing. In re Aller, 220 F.2d 454, 456, 105 USPQ
233, 235 (CCPA 1955). While appellants stress that Nealy and
Barton do not teach or suggest the claimed surface tension and
viscosity for the disclosed inks, appellants have not
explained why one of ordinary skill in the art would not have
found it obvious to modify the inks of Nealy and Barton with
respect to surface tension and viscosity to make them amenable
for ink jet printing. Furthermore, as pointed out by the
examiner, Kyser and Dexter disclose that typical parameters
for ink jet printing inks are a viscosity of 6 cP and a
surface tension of 50 dyne/cm, which values fall directly
within the claimed ranges. Accordingly, since values for
viscosity and surface tension within the claimed ranges are
described as typical for ink jet printing inks, we agree with
the examiner that it would have been prima facie obvious for
one of ordinary skill in the art to formulate the inks of
Nealy and Barton in accordance with such viscosities and
surface tension. While appellants maintain that "the
secondary references of Kyser and Dexter are directed to
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