Appeal No. 1997-4373 Page 9
Application No. 08/332,656
Fujimori accomplishes this by means of a pressure regulating
valve (6) which acts to maintain a constant pressure
differential between the delivery pressure and the intake
manifold pressure.
Masahiko discloses a solenoid operated spill valve (46,
47, 48) for use in regulating the effective duration of pump
stroke to supply the necessary amount of fuel to maintain a
desired delivery pressure calculated in response to detected
values of engine speed, load and fuel pressure (pages 6 to 8
and 22). The solenoid valve of Masahiko is not used for
maintaining a pressure differential and, thus, would not have
commended itself to one of ordinary skill in the art as a
substitute for the pressure regulating valve (6) of Fujimori.
With further regard to the rejection of claim 6, which
depends from claim 5, we have reviewed the teachings of
Paganon, but find nothing therein which overcomes the
deficiencies of the Fujimori and Masahiko combination
discussed above.
Further, with regard to claim 27, we find no suggestion
in the applied references to provide a pressure reducing means
which acts only at the beginning of the pumping stroke in the
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