Appeal No. 1997-4117
Application No. 08/344,746
See, col. 3, lines 20-45. Golestan teaches that while the
channel 24 may have a constant width, a tapered channel design
is preferred because it reduces the likelihood that a fluid
borne particle will lodge itself within a channel (col. 7,
line 47-50 and col. 8, lines 26-29)).
As to the shape of the flow channel or slot [24],
Golestan teaches that the channels have a varying depth
throughout their length and a bottom which generally follows
the cylindrical contour of side wall [68], but that other
embodiments may have channels of substantially constant depth
or bottoms of varying contour to alter the flow
characteristics of the piston (col. 5, lines 17-23). In
addition, Golestan teaches that while the piston is shown in
the drawings as having three substantially identical channels
which are symmetrically spaced around the exterior of the side
wall, other embodiments may have more or fewer channels, which
may or may not be symmetrically spaced, as the desired flow
rate design dictates (id. at 11-17).
Both Duell and Golestan show a piston body including a
plurality of channels formed in the exterior surface thereof.
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