Patent ID: 7700378

Claim:
A computer program product, comprising a computer usable medium having a computer readable program code embodied therein, said computer readable program code comprising an algorithm adapted to implement a method for controlling a plasma etch process, said method comprising the steps of: storing a measurement target value for a measurement of a mask feature of a patterned mask layer formed on a top surface of a precursor layer on a substrate; storing a mask feature measurement value of said mask feature; storing a bias etch time target value for a layer feature to be formed from said precursor layer; storing a total time of selected radio frequency power-on times of a plasma etch tool since an event occurring to a chamber or chambers of said plasma etch tool; calculating a mask trim plasma etch time for said patterned mask layer based on said measurement value, said measurement target value, said bias etch time target value and said total time; and sending data based on said calculating said mask trim plasma etch time to said plasma etch tool.