Appeal No. 1998-1133
Application 08/382,296
pollutants from an adsorbent bed, a major portion of exhaust
gases is bypassed around the adsorbent bed and a minor portion
of exhaust gases is passed through the adsorbent bed
(abstract). Immediately downstream of the adsorbent bed can
be positioned a catalyst bed whose major function is to
convert hydrocarbons and carbon monoxide to carbon dioxide and
water (abstract; col. 10, lines 1-14). The system is switched
to this condition in which a minor portion of the exhaust
gases is passed through the adsorbent bed and catalyst and the
remaining exhaust gases is bypassed around these components,
however, only after a downstream primary catalyst bed reaches
a selected temperature which typically is 350-400EC (abstract;
col. 6, lines 13-17). Dunne teaches that such a primary
catalyst works quite well after it has reached an operating
temperature of about 300EC (col. 1, lines 31-33; col. 5, lines
46-48), which indicates that Dunne’s system is capable of
switching to the above condition only after ignition of the
primary catalyst rather than beforehand as required by the
appellants’ claim 21.
Säufferer discloses a system wherein a bypass (5) around
a quick-warm-up catalytic unit (3) is closed during start-up
5
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