Patent ID: 6575616
Filing Date: 2003-06-10
Classification: B01F

Abstract:
An impeller for a mixing apparatus, comprising:a substantially planar disc having a hole through the center for receiving a motor driven shaft mixing member, said planar disc having upper and lower opposite faces and one or more apertures therethrough, with each of said apertures having an upper periphery defining an edge of said lower face and a lower periphery defining an edge of said upper face, wherein points of said lower face extend from said upper periphery at first angles with respect to the plane of the planar disc that are a function of the radial locations of said points, and wherein radially corresponding points of said upper face extend from said lower periphery at second angles that are substantially equal to the corresponding said first angles, and wherein said apertures have radially innermost ends and radially outermost ends at which said first and second angles are substantially zero, and wherein said first and second angles increase from each of said ends to reach a maximum substantially mid-way therebetween.