Appeal No. 1997-4117
Application No. 08/344,746
1, 10 and 27, respectively, or a piston body having planar
exterior surfaces (brief, page 11).
We agree. Claims 1, 10 and 27 are drawn to a flow
control piston comprising a nose region [12] and an elongated
body [14] connected to a trailing edge of the nose region and
having an outer surface with a particular shape and planar
exterior faces. The particular shape claimed is square in
claim 1, hexagonal in claim 10, and pentagonal in claim 27.
The patent to Duell concerns an expansion device for
throttling refrigerant vapors moving between a pair of
heat exchangers which permit the function of the exchangers to
be automatically reversed when the cycle operation is changed
from a cooling mode to a heating mode (col. 1, lines 5-11].
With
reference to Figure 2, Duell describes an expansion device
[15] comprising a generally cylindrical housing [30] (col. 3,
lines 62-67) having a flow passage [35] which opens into an
expanded annular chamber [36] (col. 4, lines 5-7]. A
free-floating piston [45] is slidably mounted within the
5
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