Patent ID: 7431772

Claim:
A self-cleaning gas distributor capable of distributing a gas across surfaces in a substrate processing chamber, the gas distributor comprising: (a) a hub comprising a gas inlet to receive a gas and a gas outlet comprising first and second terminus to expel the received gas; (b) a baffle extending radially outward from the hub, the baffle having opposing first and second surfaces and comprising an outer perimeter; (c) a plurality of spaced apart first vanes on the first surface of the baffle, the plurality of first vanes extending upwards from the first surface and configured to direct the gas expelled from the first terminus across a chamber surface, each first vane comprising an arcuate plate that curves outward from the hub to the outer perimeter of the baffle; and (d) a plurality of second vanes on the second surface of the baffle, the plurality of second vanes comprising a plurality of surfaces that are inclined to the second surface of the baffle and wherein pairs of inclined surfaces are configured to direct the gas expelled from the second terminus across a sector of the second surface of the baffle to clean the gas distributor.