Appeal No. 1998-1493
Application No. 08/377,861
disclose "rich-burn" engines in that all are directed to
disposing of combustibles that remain in the exhaust gases
after the fuel is burned in the engines, which indicates that
the mixture burned in the engine is "rich." As to the
designation of
"small," which the appellant has defined in the specification
as meaning "a displacement of about 800 cc, preferably between
100 and 600 cc" (page 5), while none of the references
explicitly state that the engines with which the disclosed
exhaust emission control devices are utilized fall into the
size range defined by the appellant, neither do they state
that they do not. Thus from our perspective and in the
absence of evidence to the contrary, one of ordinary skill in
the art would have recognized that the methods for controlling
emissions disclosed therein would be applicable to engines of
the appellant’s size range.
It is our opinion that Aronsohn discloses all of the
steps recited in claim 8. In the Aronsohn arrangement, the
exhaust gas pulses are passed through a nozzle to provide a
gas jet
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