Appeal No. 2003-0079 Page 8
Application No. 09/532,114
opposite of that required by claim 6, that is, it is the primary fuel line that is connected to
the carburetor at a location between the throttle valve and the second end of the air
conduit and the secondary fuel line that communicates with the nozzle at a point in the
air conduit upstream of the engine. The examiner has provided no evidence that the
Ikeda system is capable of operating with the percentage of gaseous fuel being greater
than that of the liquid fuel, or that one of ordinary skill in the art would have found it
obvious to do so. In this regard, the problem to which Ikeda is directed is solved by
adding a secondary gaseous fuel to the primary liquid fuel, and to reverse the fuel
percentages would destroy the Ikeda invention, which would be a disincentive to the
artisan to do so.
Ikeda therefore fails to disclose or teach primary and secondary fuel lines as
required by claim 6, as well as the limitations that the primary fuel line deliver acetylene
fuel directly into the combustion engine the throttle valve upstream of the liquid fuel line.
Takeda discloses fuel injectors for a single fuel engine in which the fuel is liquid,
for there is no mention of a second fuel, gaseous or otherwise, and the problem to
'which the invention is directed is better atomization of a fuel (column 1), which would
indicate that the fuel is a liquid. The examiner has found that it would have been
obvious to replace the carburetor of Ikeda with a separate throttle valve located
upstream of a fuel injector in view of the showing of Takeda "for more accurate control
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