Patent ID: 6269764
Filing Date: 2001-08-07
Classification: G04F

Abstract:
A timing device for visually determining the passage of a preselected period of time comprising:(a) an inverted U-shaped tube comprising a central portion and a pair of legs extending downwardly from the central portion, one of said legs having a greater length than the other of said legs, each of said legs having an end with a reservoir located in at least one of said ends and said ends being spaced apart from each other;(b) transport means within the inverted U-shaped tube extending from the reservoir to the other end of the tube;(c) a reactant present in said tube; and(d) an indicator present in said tube such that prior to the initiation of the preselected period of time the reactant and indicator are not in contact with each other, wherein when the reactant and indicator come in contact with each other as the result of one of said reactant and said indicator traveling along said transport means to the other of said reactant and said indicator, the indicator emits an observable change in a property wherein a minimum length of the preselected period of time corresponds to the time it takes for the reactant and indicator to contact each other and the indicator to emit said observable change in property.