Appeal No. 1997-1412 Page 10
Application 08/139,888
sub assist gas nozzle (D2) is at least as wide as that of
outlet of the main assist gas
nozzle (D1). (Spec. at 9.) Third, the outlet of the main
assist gas nozzle is upstream from that of the sub assist gas
nozzle. (Id.)
Babel teaches the same combination of structural
features. First, the diameter of a cone-shaped outer liner 30
tapers from a wider, upstream diameter on its flat upper side
to a narrower, downstream diameter at its outlet. Fig. 8.
Second, the diameter of the outlet of the cone-shaped outer
liner 30 is at least as wide as that of outlet of the central
multi-graduated passage hole 36. Id. Third, the outlet of
cone-shaped outer liner 30 is upstream from that of the
central multi-graduated passage hole 36. Id. We find that
the combination of these features reasonably supports the
examiner’s determination that an increase in pressure
fluctuation and flow fluctuation of the main assist gas flow
in comparison with the sub assist gas flow necessarily flows
from the teachings of Babel.
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