Appeal No. 1996-4167 Page 5
Application No. 08/324,369
blocked and in which the tap communicates with the inlet via the first flow passage to
receive the extrudate and direct the extrudate to the outlet bore, (2) a running position
in which the extrudate can pass from the inlet to the outlet via the first flow passage and
through the first filter and (3) a blocking position in which extrudate flow to both the tap
and the first filter is blocked and flow through the first flow passage is blocked; and the
second cartridge being movable between (1) a running position in which extrudate can
pass from the inlet to the outlet via the second flow passage and through the second
filter and (2) a blocking position in which extrudate flow to the second filter is blocked
and flow through the second flow passage is blocked. However, these limitations are
not suggested by the combined teachings of the applied prior art for the following
reasons.
Shirato, Lin and the Admitted Prior Art teach or suggest a filter-replacement
device for an extruder having a housing having an inlet and an outlet for flowing plastic
extrudate; first and second flow passages for the extrudate extending between the inlet
and the outlet; first and second linear bores that extend through the first and second
passages; and first and second cartridges, respectively accommodating replaceable
first and second filters and adapted to move back and forth inside a respective one of
the first and second bores from a running position in which the extrudate can pass from
the inlet to the outlet via the first flow passage and through the respective filter and a
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