Appeal No. 1995-4804
Application No. 07/861,387
an even cleaner filtrate to avoid the build-up of chloride.
See column 22, lines 59-67. Griggs, however, does not teach
oxidizing the organic material in the wash liquid prior to
using it in the above mentioned washing stage to improve the
efficiency of the ozone bleaching stage.
To remedy this deficiency in Griggs, the examiner refers
to the disclosure of Stawicki. See Answer, page 3. Relying
on column 7, lines 17-28, of the Stawicki disclosure, the
examiner concludes (Answer, page 3) that:
It would have been obvious to one of ordinary
skill in the art to oxygenate the organics in the
filtrate of [Griggs] to make the organics less
attractive to the bleaching chemical (ozone) in the
bleaching stage of [Griggs] in the manner taught by
[Stawicki] to make more effective use of the
bleaching agent (ozone).
The dispositive question is, therefore, whether it would
have been obvious to one of ordinary skill in the art to treat
the wash water with oxygen prior to its use in a washing stage
which comes before an ozone bleaching stage. We answer this
question in the negative.
We find that Stawicki teaches introducing oxygen into the
dilution zone of an extraction stage or into wash recycle
filtrate which is supplied to the dilution zone of an
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