Patent ID: 8789544

Claim:
A dishwasher, comprising: a casing; a tub installed inside the casing; and the filter assembly having a plate filter and a cylindrical filter formed through the plate filter, wherein the cylindrical filter comprises: an upper filter disposed on the plate filter; an internal filter that communicates with the upper filter and disposed under the plate filter; and an external filter that covers the internal filter, wherein the internal filter and the external filter are spaced apart from each other by a certain interval, wherein a cutout opening is longitudinally formed at a side of the external filter and internal filter, respectively, and both the cutout openings communicate with a drain hole formed in the tub, wherein the cutout opening of the internal filter and the cutout opening of the external filter are formed at positions corresponding to each other, wherein a plurality of ribs protrudes from a circumferential portion of the cutout opening of the external filter and external ends of the plurality of ribs contact an internal wall of the tub, wherein a fluid passage is formed by the plurality of ribs that connects an inside of the cylindrical filter and the drain hole, and wherein the plate filter comprises: a filter frame; a filter installed inside the filter frame; and at least one filter supporter that protrudes toward a center of the filter of the plate filter and supports a bottom surface of the filter of the plate filter to prevent the filter of the plate filter from drooping, and wherein the at least one filter supporter includes a coupling groove that couples to the plurality of ribs.