Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
July 21, 2009
Patent Application Number
10580106
Date Filed
November 1, 2004
Patent Primary Examiner
Patent abstract
A marking tape comprising at least one resonant circuit, each resonant circuit comprising an inductive coil and a capacitor, forming a resonant circuit of a selected frequency, comprises inductive coils and capacitors formed by conductive material layers (2, 3, 4) on the surfaces of a dielectric plastic film (1) and is dimensioned to be wireless detected when positioned in a hidden location. Such marking tape can be produced with low cost and provide a wireless detection of the integrity of a marking tape in a hidden position, e.g. from the surface above a subterranean positioned marking tape.
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