Appeal No. 2006-0962 2
Application No. 10/117,981
15. A centrifugal pump having an impeller rotatable about
an axis, such impeller having a plurality of generally radially
extending vanes, and a pump casing including a bowl receiving the
impeller and having an inlet side for intake of material into the
pump bowl and a rear side opposite the inlet side, an intake
plate mounted at the inlet side of the pump casing and having an
inlet aperture, the impeller vanes having edges closely adjacent
to the inner surface of the intake plate facing the pump bowl,
such inner surface of the intake plate having a shallow recess
extending generally obliquely relative to a radius from the axis
of rotation of the impeller, the shallow recess having an abrupt
edge for assisting in cleaning the impeller vanes of material as
the impeller rotates and the vanes pass along the inner surface
of the intake plate, the abrupt edge of the recess being undercut
at a large acute angle.
The prior art references relied upon by the examiner in
rejecting the appealed claims are:
Hartman 2,245,035 Jun. 10, 1941
Arbeus 6,139,260 Oct. 31, 2000
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