Dishwasher filter system

Details Dishwasher filter system Dishwasher filter system

2008-04-01

2008-04-01

Barr, Michael (Department: 1792)

Cleaning and liquid contact with solids

Apparatus

Having self cleaning means

C134S0580DL

Reexamination Certificate

active

07350527

ABSTRACT:
A filter system for dishwasher with a sump having inlets leading to a wash pump and a drain pump in the bottom wall. The filter assembly includes a vertical filter retainer an overlying perforate hood, a multiple porosity filter element carried on the filter retainer and a back wash sprayer rotatably mounted inside the filter retainer with at least one backwash nozzle directed toward the filter assembly. The inlet leading to the wash pump is positioned inside the filter element and the inlet to the drain pump is located outside the filter element. The filter element has openings that vary in size from the top to the bottom of the filter element. The filter element openings can be arranged in bands of different porosity openings including fine, medium and coarse porosity openings. The perforate hood can have coarse porosity openings.

REFERENCES:
patent: 3989054 (1976-11-01), Mercer
patent: 4418868 (1983-12-01), Gurubatham et al.
patent: 5345957 (1994-09-01), Cooper et al.
patent: 5700329 (1997-12-01), Edwards et al.
patent: 6234184 (2001-05-01), Tuller et al.

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