Patent 7581688 was granted and assigned to Whirlpool Corporation on September, 2009 by the United States Patent and Trademark Office.
Processing food items in a blender by operating the cutter assembly at a predetermined operating speed, reducing the operating speed of the cutter assembly t, and accelerating the operating speed of the cutter assembly in response to the items in the container having settled around the cutter assembly until the food items are suspended above the cutter assembly.