Appeal No. 96-3854
Application No. 08/027,872
persuasive. Bach teaches that the container 4 is emptied
after the first step of the disclosed method and that in the
second step measuring liquid is passed through the filter 11
and out chamber 4 through open outlet valve 5 (col 4, line 63
through col. 5, line 12). Bach also discloses that this
second test period may be five to fifteen minutes long (col.
5, lines 20 and 21). Bach does not disclose what happens to
the sampling liquid after it passes through outlet valve 5.
Thus, whether or not the sampling liquid is returned to the
main flow does not appear to be a matter of concern to Bach.
In any event, if it were deemed desirable to
return sampling liquid to the main flow in Bach, this could be
accomplished without making the liquid flow parallel to the
filter strip. On the other hand, Madden provides parallel
flow for a reason, namely, to clean the surface of the filter
medium, that would appear to be of little or no concern to
Bach, since Bach provides an arrangement for periodically
replacing the filter medium in the form of supply reel 18 and
take-up reel 17. In our view, it is only through the use of
11
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