Appeal No. 1997-0664
Application No. 08/280,945
use of the recited “at least one compound which contains
nitrogen” (appealed claims 1, 14, and 25) (answer, page 4).
To remedy this deficiency in Holley, the examiner relies
upon the teachings of Burton and Jackson. According to the
examiner, Burton teaches that NO pollutants are formed during
x
the high temperature combustion of carbonaceous fuel, that
such pollutants are undesirable, and that the pollutants can
be reduced by spraying a solution of urea and water to the
effluent of the combustion gas (answer, pages 4-5). The
examiner also relies upon Jackson for the teaching that the
pickling bath may contain nitric acid and, in addition, urea,
which is described in the reference as inhibiting the
accumulation of nitrous acid and NO (answer, page 5).
x
Further, the examiner adds that “Jackson et al fairly suggest
the feasibility of having a mixture of urea/acid solution and
the urea is still capable of removing the NO compounds”
x
(answer, page 6) but explains that “Jackson et al is only
applied to teach that the presence of urea in a pickling bath
would not have any negative effect on the pickling process and
in [the] pickling art, the artisan recognizes that NO is
x
[are] undesirable by-products” (answer, page 13).
Based on these prior art teachings, the examiner
concludes that it would have been obvious to one of ordinary
7
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