Appeal No. 1997-3267
Application 08/324,386
space are adjustable. Some examples are: on page 5, “a product
space under a specifiable pressure”; on page 8, “the crucial
product space is kept either at atmospheric pressure or at a
pressure higher or lower than atmospheric pressure”; and on
page 9 “the positive pressure can be adjusted according to
requirements" and "the desired pressure differential can be
adjusted independently of one another.” Furthermore, Stahl
specifically teaches appellant’s limitation of a pressure
differential of 1-2 bar on pages 5-6 of the translation. We
further understand Stahl to teach a closed system where the
positive pressure and the pressure at the vacuum filter is
settable to any pressure known in the art to solve a particular
filtration problem. Specifically, claim 11 of Stahl, rewritten
to include all the limitations of the claims from which it
depends, is as follows:
Arrangement for filtration, in which
in a filter constructed in its design as a
vacuum filter, solid particles are to be
filtered out of a fluid with the assistance
of a porous material layer, in particular a
filter cloth serving as filtering means,
characterized in that the entire vacuum
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