초록 ▼

The time indicator device of this invention is provided with a display layer with at least one defined display region therein. A migration layer is provided which overlies and is attached to the display layer. The migration layer has at least one migration region therein and in use each migration re

The time indicator device of this invention is provided with a display layer with at least one defined display region therein. A migration layer is provided which overlies and is attached to the display layer. The migration layer has at least one migration region therein and in use each migration region is in contact with at least one display region. An activation layer is provided which has at least one defined activation region therein. The activation region includes a migrating agent capable of migrating laterally through the migration region. When the activation layer overlies the migration layer, each activation region overlies at least one migration region. The migration region connects each activation region with at least one display region which is laterally distal from the activation region. In use and in order to activate the device the activation layer and migration layer are adhesively attached to each other. When the activation layer is contacted with and overlies the migration layer, each activation region contacts at least one migration region. Upon contact the migrating agent is activated to migrate laterally from the activation region through the migrating region to at least one display region in a predetermined amount of time to cause an indication in the display region that the predetermined amount of time has elapsed. Preferably, the device has a plurality of defined display regions, defined activation regions and/or migration regions to provide a means for adjusting the predetermined time, adjusting for environmental conditions and to provide a plurality of elapsed times.

대표청구항 ▼

A time indicator comprising: a display layer having a defined display region therein; a migration layer overlying and attached to the display layer, the migration layer having a migration region therein, the migration region in contact with the display region at a display region contact area; an act

A time indicator comprising: a display layer having a defined display region therein; a migration layer overlying and attached to the display layer, the migration layer having a migration region therein, the migration region in contact with the display region at a display region contact area; an activation layer having a defined activation region therein, wherein the activation region includes a migrating agent capable of migrating laterally through the migration region, wherein when the activation layer overlies the migration layer, the activation region overlies the migration region, the migration region connecting the activation region with the display region which is laterally distal from the activation region at the display region contact area; adhesive means associated with the activation layer or migration layer for adhesively attaching the activation layer to the migration layer; whereby when the activation layer is contacted with and overlies the migration layer, the adhesive means adhesively attaches the activation layer to the migration layer causing the activation region to contact the migration region, wherein the migrating agent is activated to migrate laterally from the activation region through the migrating region to the display region contact area in contact with the display region in a predetermined amount of time to cause an indication in the display region that the predetermined amount of time has elapsed.