Patent ID: 6653944
Filing Date: 2003-11-25
Classification: G08B

Abstract:
A pod for transporting a cassette of semiconductor wafers comprising:a base for supporting said cassette thereon; a cover removably carried on said base for protectively covering said cassette; latch means carried on said base for latching said cover on said base, said latch means being actuatable from a latched condition in which said cover is latched on said base to a released position allowing removal of said cover from said base; and indicator means coupled with said latch means for providing a visual indication of the condition of said latch means said latch means further comprises: at least four latch keys situated around said base, each having an electrically conductive path between two ends of the key; a power source sufficient to activate said indicator means; wiring means in-between said at least four latch keys, said power source and said indicator means, such that only when all of the at least four latch keys are in a latched position electrical current flows through said wiring means to activate said indicator means.