| 摘要 |
There is described an indicator device for indicating the passage of time, the indicator device comprising an indicator section and a barrier section adjacent thereto, said indicator section comprising: an indicator material; a substrate material; and a first adhesive layer; the indicator material and the substrate material being in the form of one or more layers; the indicator material displaying different visible properties in response to the presence or absence of a chemical agent and/or the concentration thereof; the barrier section comprising a removable barrier layer, the removable barrier layer being substantially impermeable to the chemical agent; wherein on removal of the removable barrier layer, the concentration of the chemical agent in the indicator section changes over time, effecting a visible change. The device may be used to detect the presence/absence of oxygen, water, carbon dioxide, an amine, ammonia, and/or carboxylic acids or to indicate the passage of time. |
| 主权项 |
1. An indicator device for indicating the passage of time, the indicator device comprising:
an indicator section and a barrier section adjacent to the indicator section, the indicator section comprising:
an indicator material;a substrate material; anda first adhesive layer;the indicator material and the substrate material being in the form of one or more layers;the indicator material displaying different visible properties in response to the presence or absence of at least one of a chemical agent the and a concentration of the chemical agent; the barrier section comprising a removable barrier layer, the removable barrier layer being substantially impermeable to the chemical agent; wherein upon removal of the removable barrier layer, the concentration of the chemical agent in the indicator section changes over time, effecting a change in visible properties of the indicator material. |
