Appeal No. 2001-0965
Application 08/751,035
cereals are ground to produce unseparated flour having a
specified particle size. In claim 33 the particle size is such
that about 60% to about 70% of the flour passes through a 60 mesh
screen, and in claims 34 and 39 the particle size requirement is
that from 30% to 40% of the flour has a particle size which
prevents it from passing through a screen of 253 :m. The
independent claims all require steps of mashing, boiling and
filtering, in that order.1
The Practical Brewer discloses a typical screen analysis for
a mash filter operation wherein 45% of the particles are retained
on a #60 screen (page 67).
Blum discloses a process for producing a boiled malt wort
(col. 1, lines 9-10). Blum teaches (col. 2, lines 18-33):
The desirable advantages of the process of this
invention can be achieved by using a malt flour and by
placing the filtration step after the boiling operation
instead of between the mashing and boiling cycle. This
will also permit these operations to be carried out in
a single reaction vessel.
In order to achieve filtration after boiling, the
malt must be ground fine enough so that complete
conversion takes place during the mashing cycle.
Otherwise unexposed starch granules will be liberated
during boiling, and will later interfere with
fermentation and beer clarity. Malt flours ground fine
enough to pass through a 60 mesh screen have been found
1 The appellants state in their specification that the conventional sequence is mashing-
filtering-boiling (page 1, line 8 - page 2, line 3).
3
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Last modified: November 3, 2007