Patent ID: 8220986

Claim:
A mixer impeller comprising: a central hub; and a plurality of blades attached to and extending radially outwardly from said hub such that leading edges thereof are inclined upwardly from trailing edges thereof, each of said blades having a root attached to said hub, a tip, a first, substantially rectilinear crease extending along substantially an entire length of said blade dividing said blade into a leading portion and a trailing portion, said leading and trailing portions each being substantially flat, and meeting at said first crease such that said leading portion is angled downwardly from said trailing portion, and a second, substantially rectilinear crease extending from a portion of said leading edge of said leading portion between said root and said tip diagonally along said leading portion to said tip, said second crease intersecting said tip at a point spaced toward said leading edge from a point where said first crease intersects said tip, said second crease forming a tip portion of said leading portion that meets a remainder of said leading portion such that said tip portion is angled downwardly from said remainder of said leading portion.