Patent ID: 7114844

Claim:
An aeration impeller for use in a liquid mixing assembly having an axis of rotation, comprising: a hub; a first blade connected to said hub, said first blade having in profile a generally straight first portion positioned at an angle to the axis of rotation, the first portion having a first free lower end and an upper region, and a generally straight second portion positioned at an angle to said first portion and oriented substantially parallel to the axis of rotation, wherein said first portion has a width and comprises an opening that at least partially extends the width of said first portion, and a generally straight third portion positioned at an angle equal to approximately 90 degrees to the second portion and oriented substantially perpendicular to the axis of rotation, the third portion having a second free forward facing end and a rear region, wherein the second portion spans between the upper region of the first portion and the rear region of the third portion; and a second blade connected to said hub, said second blade having in profile a generally straight first portion positioned at an angle to the axis of rotation, the first portion having a first free lower end and an upper region, and a generally straight second portion positioned at an angle to said first portion and oriented substantially parallel to the axis of rotation, wherein said first portion has a width and comprises an opening that at least partially extends the width of said first portion, and a generally straight third portion positioned at an angle equal to approximately 90 degrees to the second portion and oriented substantially perpendicular to the axis of rotation, the third portion having a second free forward facing end and a rear region, wherein the second portion spans between the upper region of the first portion and the rear region of the third portion.