Patent ID: 7363115
Filing Date: 2008-04-22
Classification: B01F,G05D,H01L

Abstract:
1. A method of formulating a composition having a predetermined volume comprising two or more chemicals, each chemical being present in the composition in a predetermined quantity, the method comprising: admitting at least two chemicals into a container to form a composition until the container is partially filled to a predetermined fraction of the predetermined volume; blending the composition in the container; determining the homogeneity of the blended composition; continuing blending of the composition until the homogeneity of the composition is at least at a predetermined homogeneity value; determining the quantity of each chemical needed to fill the container to the predetermined volume, or to a selected volume between the volume of the partially filled container and the predetermined volume, after the homogeneity of the composition is at least at a predetermined homogeneity value, wherein the quantity of each chemical is calculated as a function of the determined quantity of one or more of the chemicals in the composition; and dispensing the determined quantity of the chemicals to the container; wherein the homogeneity is determined as a function of an average change in the quantity of one or more chemicals of the composition over a predetermined time period.