G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 33/52 (2006.01) G01N 31/22 (2006.01) G04F 1/00 (2006.01) G07C 1/00 (2006.01)
Patent
CA 2072643
16 ABSTRACT: This invention relates to an indicator for attachment to objects to display elapsed times and/or changes of state, in which a visible display is brought about by color change of the indicator or the like by reaction of chemical substances and with destruction of a barrier first separating the chemical substances. In this case, it is provided that the barrier is a separating or covering layer that can be penetrated by selective pitting by a chemical substance first enclosed by the barrier. An embodiment of the invention is characterized by a surface manifesting itself by the selective pitting with visible change of the indicator. Another embodiment of the invention is characterized in that the barrier separates from one another two chemical substances that can react with one another with visible change, of which at least one reacts chemically with the barrier for the latter's penetration.
Langenfeld Bruno
Muller Hubert
Badische Tabakmanufaktur Roth-Handle Gmbh
Barrigar & Moss
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