US Patent 7445013 Multiple wash zone dishwasher

The present invention relates to a dishwasher, and more particularly to a dishwasher having multiple wash zones. The dishwasher has an interior tub configured to provide an interior wash chamber for washing dishes. It also has a spray arm assembly configured to rotate within the tub and to spray a first flow of wash liquid over a portion of the interior tub thereby providing a first wash zone. A spray manifold fixed adjacent a lower dish rack, the manifold configured to provide a second flow of wash liquid toward the lower dish rack thereby providing a second wash zone.