| 20110037569 | COVERING AND/OR SEALING FOIL FOR A PACK AND METHOD AND SYSTEM FOR DETERMINING THE OPEN STATE OF A PACK - The invention relates to a covering and/or sealing foil for a pack, in particular blister pack, configured to seal at least one filling compartment and to enable access to the filling compartment by separation and/or tearing, wherein the film, in particular in the region of the filling compartment, has a predetermined electroconductive property, which can be contacted for electronic evaluation and, as a reaction to the separation or tearing, undergoes a change that can be evaluated, wherein the electroconductive property influences the oscillation frequency of an electrical frequency generator unit which is formed on the foil and the frequency generator unit is configured to cooperate with an antenna which is formed on the foil by means of an antenna strip conductor in such a way that the antenna and/or an associated electrical capacitance causes electrical energy to be supplied to the frequency generator unit and the frequency generator unit modulates an antenna signal of the antenna by means of the oscillation frequency. | 02-17-2011 |
