Appeal No. 1997-3267
Application 08/324,386
in a closed space under a positive pressure with respect to the
open air” (translation, page 5) and “feeding of the filter in the
arrangement . . . can be done . . . [with] the aid of pumps . . .
such that the positive pressure in the positive pressure chamber
is taken into account” (translation, page 7). Stahl further
shows, in Figure 2, an embodiment having a “product space [that]
is kept higher than atmospheric pressure” and where it is
“preferable to use an arrangement which is distinguished by the
fact that the pressure difference between the space kept under
positive pressure and the product space in a subterranean tunnel
can be adjusted up to a maximum value which can be selected
exclusively according to the requirements of the filtration
problem” (translation, page 7). The appellant argues that there
is no teaching or suggestion within Stahl for supplying the
feedstock (25) to the enclosed pressure space at a pressure
greater than atmospheric and that it is clear that the material
to be separated is only subjected to the positive pressure when
in the positive pressure chamber and not in the prior supply
portions, hence the need for the supply pumps to take the
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