Appeal No. 1999-1899 Page 6
Application No. 08/932,090
We shall sustain this rejection.
Heyl discloses an "apparatus for receiving particulate
matter from a container by which the matter was transported
and filtering from the ambient atmosphere dust particles
produced by transfer of the particulate matter to the
receiving apparatus" (column 1, lines 20-24). Heyl's bag dump
station (110), seen in Figures 8 and 9, comprises a hopper
(112) for receiving particulate material transferred thereto
(column 6, lines 57-59), a filter mechanism (118), a
centrifugal blower (120) establishing an airflow as shown by
the arrow (210) in Figure 9 and a grate (124) covering the
face of the hopper. As a result of the airflow or pneumatic
path (210), the larger and heavier particles will drop
directly into the hopper (112), and the remaining particles
will be dispersed over filter elements (130) (column 7, lines
51-55).
The examiner states that "Heyl is silent as to at least
one secondary inlet" (answer, page 4) and then argues, in
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