Patent ID: 6151533
Filing Date: 2000-11-21
Classification: H01L,Y10S

Abstract:
A collation method of stocker storage employed in a semiconductor wafer cassette transportation apparatus includinga stocker for storing a plurality of semiconductor wafer cassettes,a processing apparatus for applying a process on said semiconductor wafer cassette,an automatic carrier for carrying out a transportation task of said semiconductor wafer cassette between said stocker and said processing apparatus,an inter-stocker transport device for carrying out a transportation task of said semiconductor wafer cassette between a source stocker and a destination stocker, anda host computer for providing control of said stocker, said inter-stocker transport device, said automatic carrier and said processing apparatus,said host computer includinga terminal for transmitting an instruction from an operator to said host computer, and providing a display of a result, andstocker storage memory means for storing storage information of a stocker,said collation method of stocker storage comprising the steps of:interrogating about storage of said semiconductor wafer cassette in said stocker in response to an instruction from an operator,receiving storage information of said semiconductor wafer cassette from said stocker,comparing the storage information sent from said stocker with the storage information of said stocker stored in said stocker storage memory means, andwhen the storage information retained by said stocker differs from the storage information of said stocker stored in said stocker storage memory means, providing a display on said terminal of discrepancy in storage information.