Patent ID: 8821681

Claim:
Apparatus for wet treatment of a single disc-like article comprising: a spin chuck for holding and rotating a disc-like article of a predetermined radius (ra), and two inner edge nozzles each dispensing treatment liquid directed towards a first peripheral region of a first surface of the disc-like article when held by the spin chuck, wherein the first surface is facing the spin chuck and the first peripheral region is defined as being a region of the first surface extending from an inner radius (ri) to the predetermined radius (ra) of the disc-like article, and having a radial extent which is greater than 1 cm and less than said predetermined radius (ra), wherein each of said two inner edge nozzles is positioned in a stationary manner between the disc-like article (when placed on the spin chuck) and the spin chuck, wherein each of said two inner edge nozzles is fed through a central pipe, which is disposed in a stationary manner and penetrates centrally through the spin chuck, and wherein each of the two inner edge nozzles communicates with a supply of a respectively different treatment liquid, so that different liquids can be supplied simultaneously through said two inner edge nozzles without intermixing of the different liquids prior to exiting said two inner edge nozzles.