Patent ID: 6776521
Filing Date: 2004-08-17
Classification: G01K

Abstract:
A data carrier (1) having an electrical circuit (2) by means of which are implemented indication means (3) that are arranged for indicating a change in a parameter influencing the data carrier (1) in relation to a threshold value of the parameter, which threshold value divides a first parameter range from a second parameter range, characterized in that;the indication means (3) are arranged to give a permanent indication of the change in the parameter during the time following first the occurrence of the change; at least one conductor region (18, 19) is provided to determine the occurrence of the change of the parameter; at least one storage means (20) is provided that is arranged to store a medium (21) suitable for influencing an impedance, which medium (21) can be dispensed form the storage means towards the at least one conductor region (18, 19); and recognition means (25) are provided for recognizing a state of the impedance that exists in the at least one conductor region (18, 19) and that depends on the presence or absence of the medium (21).