초록 ▼

A time indicator that rapidly changes color after a specific time interval is provided. The time indicator includes a base substrate with colored dye deposited on a first surface; a barrier applied over the colored dye; and a substrate having an adhesive on a first surface thereof. The substrate and

A time indicator that rapidly changes color after a specific time interval is provided. The time indicator includes a base substrate with colored dye deposited on a first surface; a barrier applied over the colored dye; and a substrate having an adhesive on a first surface thereof. The substrate and the base substrate are put into adhesive contact. The adhesive coacts with the barrier to dissolve the barrier in a specified time interval. The adhesive then contacts the colored dye to dissolve the dye and permit the dye to migrate through the adhesive to cause a color change visible through the substrate.

대표청구항 ▼

A time indicator that rapidly changes color after a specific time interval, comprising: a base substrate with a dissolvable colored dye deposited on a first surface; a dye impermeable barrier applied over and in contact with the dissolvable colored dye; and a substrate having an adhesive on a first

A time indicator that rapidly changes color after a specific time interval, comprising: a base substrate with a dissolvable colored dye deposited on a first surface; a dye impermeable barrier applied over and in contact with the dissolvable colored dye; and a substrate having an adhesive on a first surface thereof, the substrate in adhesive contact with the dye impermeable barrier, the adhesive capable of dissolving the barrier in a predetermined time period; wherein when the substrate and the base substrate are put into adhesive contact to activate the time indicator, the dye impermeable barrier prevents contact of the adhesive with the dissolvable colored dye and the adhesive coacts with the dye impermeable barrier to dissolve the barrier in the predetermined time interval, whereupon the adhesive contacts the dissolvable colored dye to dissolve the dye and permit the dye to migrate through the adhesive to cause a color change visible through the substrate in the predetermined time interval.