Patent ID: 8498471

Claim:
A method of identifying a wafer serial number, comprising: providing a wafer having a wafer serial number thereon; performing an identification procedure on said wafer to identify said wafer serial number by means of multiple identification recipes, thereby obtaining multiple digit results which correspond to one specific digit in said wafer serial number under said multiple identification recipes, wherein said multiple digit results comprise at least two of a successful result and an unsuccessful result; and determining said wafer serial number in accordance with said multiple digit results; further comprising: providing a combination procedure to calculate all possible combinations of said digit results when said digit results of said multiple digits comprise more than one possible result; providing a check procedure; performing said combination procedure to obtain a combination result, wherein said combination procedure is initiated when said multiple digit results of multiple said digits are composed of said possible result and said unsuccessful result, and the rest of said digits have at least one said successful result after said identification procedure; and performing said check procedure to repeatedly check said combination result.