Patent ID: 7391338
Filing Date: 2008-06-24
Classification: G06Q

Abstract:
1. Sensor apparatus for use in detecting an improper orientation of an object with respect to a substantially horizontal surface, said apparatus comprising: a structure having sides in spaced apart relationship to define an enclosed space; selected material attached to said structure to shield a specified region of said enclosed space from RF signals, said shielded region being located in the lowest portion of said enclosed space when said structure is in a reference orientation with respect to said horizontal surface; an RF sensor device positioned in said enclosed space, said RF sensor device being sized to move freely within said space; and a guide element mounted in said space to guide said RF sensor device in moving between said shielded region and an unshielded region of said space, when said structure is correspondingly moved between said reference orientation and an improper orientation corresponding to an improper orientation of said object.